C.
52° Celsius
Hope this helped!
The standard value for temperature T in the Nernst equation is 25°C (298 K). This temperature is commonly used since standard-state values in thermodynamics are typically listed at this temperature.
The standard value for T in the common form of the Nernst equation is 25°C, which is equivalent to 298 K. This value is often used because most thermodynamic tables list the standard-state values at 298.15 K (or 25° C), and it's a common assumption that reactions or processes are taking place under so-called 'room temperature' conditions.
The Nernst equation itself indicates that cell potential is dependent on concentration, and it fundamentally relates the voltage of an electrochemical cell to the concentrations of reactants and products at a given temperature.
A gas occupies 72.1 at stp. At what temperature would the gas occupy 85.9 L at a pressure of 93.6 kPa?
Answer:
328.1 K.
Explanation:
To calculate the no. of moles of a gas, we can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in.
If n is constant, and have two different values of (P, V and T):P₁V₁T₂ = P₂V₂T₁
P₁ = 1.0 atm (standard P), V₁ = 72.1 L, T₁ = 25°C + 273 = 298 K (standard T).
P₂ = 93.6 kPa = 0.924 atm, V₂ = 85.9 L, T₂ = ??? K.
T₂ = P₂V₂T₁/P₁V₁ = (0.924 atm)(85.9 L)(298 K)/(1.0 atm)(72.1 L) = 328.1 K.
To solve for the temperature at which the gas occupies a given volume at a given pressure, we can use the ideal gas law equation PV = nRT.
Explanation:To solve this problem, we can use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
First, we need to find the number of moles of gas using the given information. Since the gas occupies 72.1 L at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to calculate the number of moles: n = 72.1 L / 22.4 L/mol = 3.21 mol.
Next, we can rearrange the ideal gas law equation to solve for the temperature: T = PV / (nR). Plugging in the values we have, T = (93.6 kPa)(85.9 L) / (3.21 mol)(8.31 J/mol·K) = 277 K.
This graph compares the rates of lymphoma, a cancer of the immune system, for people living within 50 miles of a factory that was illegally dumping hazardous wastes into local water supplies for the last 50 years to the national average for lymphoma. What conclusion can be drawn from this data? A) Few people living near the factor will get lymphoma. B) Most people living near the factory will get lymphoma. C) The chemicals illegally dumped may cause lymphoma to occur at an early age. D) The chemicals illegally dumped may cause lymphoma to occur at a higher rate.
Hey im happy to help!
your answer here will be:
D) The chemicals illegally dumped may cause lymphoma to occur at a higher rate.
Hope this helps, have an amazing rest of your day!
Answer:
The correct answer is option D) "The chemicals illegally dumped may cause lymphoma to occur at a higher rate".
Explanation:
In the graph "Occurrence of Lymphoma" it can be noticed that the lymphoma rate was higher for people living near the factory (local rate), but as times went by, the national rate started to be as high as the local rate. By analyzing this data it can be concluded that the chemicals illegally dumped may cause lymphoma to occur at a higher rate. The chemicals that affect people living locally started to affect people around the nation because they were illegally dumped. I attached the missing graph.
A rigid container holds a gas at a pressure of 55 kPa and a temperature of -100.0*C. What will the pressure be when the temperature is increased to 200*C
Answer:
P2 = 150.4 KPa
Explanation:
Gay-Lussac's Law:
at constant volume, the pressure of a gas varies directly with the temperature
P1/T1 = P2/T2∴ P1 = 55 KPa
∴ T1 = - 100.0°C ≅ 173 K
∴ T2 = 200°C ≅ 473 K
⇒ P2 = ?
P2 = T2*P1 / T1⇒ P2 = (473 K)(55 KPa) / (173 K)
⇒ P2 = 150.4 KPa
The pressure of the gas when the temperature is increased to 200°C will be 150 kPa.
We can use Gay-Lussac's Law, which states that the pressure of a given mass of gas is directly proportional to its absolute temperature (in Kelvin) when the volume is kept constant. Mathematically, this can be expressed as:
[tex]\[ \frac{P_1}{T_1} = \frac{P_2}{T_2} \][/tex]
where [tex]\( P_1 \)[/tex] and [tex]\( T_1 \)[/tex] are the initial pressure and temperature, and [tex]\( P_2 \)[/tex] and [tex]\( T_2 \)[/tex] are the final pressure and temperature, respectively.
First, we need to convert the temperatures from Celsius to Kelvin:
Initial temperature [tex]\( T_1 \)[/tex] in Kelvin is:
[tex]\[ T_1 = -100.0^\circ C + 273.15 = 173.15 \text{ K} \][/tex]
Final temperature [tex]\( T_2 \)[/tex] in Kelvin is:
[tex]\[ T_2 = 200^\circ C + 273.15 = 473.15 \text{ K} \][/tex]
Now we can apply Gay-Lussac's Law to find the final pressure [tex]\( P_2 \)[/tex]:
[tex]\[ \frac{55 \text{ kPa}}{173.15 \text{ K}} = \frac{P_2}{473.15 \text{ K}} \][/tex]
Solving for [tex]\( P_2 \)[/tex]:
[tex]\[ P_2 = \frac{55 \text{ kPa} \times 473.15 \text{ K}}{173.15 \text{ K}} \][/tex]
[tex]\[ P_2 = \frac{25923.25 \text{ kPa}}{173.15} \][/tex]
[tex]\[ P_2 \approx 150 \text{ kPa} \][/tex]
How do bacteria help plants grow? I NEED HELP FAST IM TIMED!!!!!!!
Final answer:
Bacteria help plants grow by fixing nitrogen, decomposing organic matter, and improving soil fertility, in a mutualistic relationship where they also gain nutrients from plant photosynthates.
Explanation:
Bacteria play a crucial role in helping plants grow by engaging in a variety of symbiotic relationships and processes. One key interaction is the presence of nitrogen-fixing bacteria such as rhizobia, which live in nodules on the roots of legumes and convert atmospheric nitrogen into forms that plants can use as nutrients, effectively supplying plants with an endless supply of nitrogen. This process naturally fertilizes the soil, promoting plant growth. In addition to this, many species of bacteria decompose organic matter, releasing nutrients back into the soil, which plants can then absorb. Bacteria also benefit from this relationship by using photosynthates, which are substances produced during photosynthesis by the plants. This mutualistic relationship is critical for the soil’s fertility and the overall health of the ecosystem.
which of the following is a hydronium ion?
A.) H2O
B.)H3O+
C.)OH-
D.)H+
B) H30+ is the answer, hope that helped
Answer: Option (B) is the correct answer.
Explanation:
A hydronium ion is an ion that contains three hydrogen atoms and one oxygen atom. Formula of a hydronium ion is [tex]H_{3}O^{+}[/tex].
Whereas water is a molecular compound with chemical formula [tex]H_{2}O^[/tex].
Hydroxide ion has formula [tex]OH^{-}[/tex] and a hydrogen ion has formula [tex]H^{+}[/tex].
Therefore, we can conclude that out of the given options [tex]H_{3}O^{+}[/tex] is a hydronium ion.
How many atoms of carbon are in 0.00115 grams of carbon?
0.00115g x 12.01g/mol (molar mass of cabon) x 6.02 x 10^23 moles/atoms = 8.31x10^21
The atoms of carbon are in 0.00115 grams of carbon is 8.31 x 10²¹moles.
What is mole ?
The term mole is defined as the amount of substance in a system which include as many elementary entities as there are atoms present in it. It is denoted by the symbol “mol”. The word mole is coming from the Latin word moles, which means “a mass”.
The mole is also defined as it contain exactly 6.023 × 10²³ elementary entities present in it. 1 mole is exactly equal to the 6.023 × 10²³ elementary entities.
Molar mass of carbon = 12.01g/mol
1 mole = 6.02 x 10²³ moles/atoms
We have to calculate 0.00115 grams of carbon in an atom.
0.00115g x 12.01g/mol (molar mass of carbon) x 6.02 x 10²³ moles/atoms
=.31 x 10²¹mole.
Thus, The atoms of carbon are in 0.00115 grams of carbon is 8.31 x 10²¹moles.
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What is generally true about the particles in a liquid? a. They are closer together and have lower energy than the particles in a solid. b.They are closer together and slower moving than the particles in a gas. c. They are farther apart and slower moving than the particles in a solid. d. They are farther apart and have lower energy than the particles in a plasma.
B would be right. Liquids are closer together than gases and liquids move slower.
Taking into account the definition of liquid state and gaseous state, the correct option is option b. They are closer together and slower moving than the particles in a gas.
Matter comes in three states or forms of matter: solid, liquid, and gas.
The solid state is characterized because the particles that compose it are very close together and in more or less fixed positions; this makes the distance between the particles practically unchanged.
This is due to the fact that the attractive forces are very strong, so the shape and volume are constant.
In the case of the liquid state, the forces between the particles are weaker than in the solid state, which allows the particles to have some freedom of rotation and translation, in addition to vibration.
That is why liquids, unlike solids, take variable forms, depending on the container that contains them and can also flow easily.
In the gaseous state, the attractive forces are practically zero, so they occupy all the available space, and they move much faster. In addition, they can be compressed and take the shape of the container that contains them.
In summary, the correct option is option b. They are closer together and slower moving than the particles in a gas.
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https://brainly.com/question/12519547?referrer=searchResultshttps://brainly.com/question/12912864?referrer=searchResultsa balloon has a volume of 1.2 liters inside a room where the temperature is 25°C.What is the volume of this balloon when it is taken outdoors on a very cold day where the temperature is -15°C?
Answer:
1.04 L
Explanation:
Charles law states that for a fixed mass of gas, volume of gas is directly proportional to the absolute temperature at constant pressure.
[tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]
where V1 is the volume and T1 is absolute temperature at first instance
and V2 is volume and T2 is absolute temperature at the second instance
Absolute temperature is temperature in the kelvin scale
T1 - 25 °C + 273 = 298 K
T2 - -15 °C + 273 = 258 K
substituting the values in the equation
[tex]\frac{1.2 L}{298K} = \frac{V2}{258K}[/tex]
V2 = 1.04 L
when the temperature is -15 °C the volume is 1.04 L
When does a cold front develop? A. when two masses of warm air meet B. when a cold air mass invades a warm air mass C. when two masses of cold air meet D. when a warm air mass invades a cold air mass
Answer:b
Explanation:
Soil erosion is a secondary environmental problem because it only degrades the land and does not affect water or air quality.
True or false ?
The correct answer is - False.
The soil erosion is a primary environment problem. It latter has effects that fall into the category of secondary environmental issues. The erosion of the soil is a very serious environmental issue, as it is the prime natural resources that enables the growth of plants, thus food for the living organisms, including the humans. Also, with high rates of erosion, the process of desertification significantly increases, as the soil is stripped of its top layers. The sediments that have been stripped of the soil can cause pollution of the air, though the stronger winds and storms that carry them, or with sediments getting to the water bodies and making them all murky, muddy.
The directional term that refers to an area or structure off to the side and away from the midline is __________.
.
Answer:
Lateral
Explanation:
Is the opposite side of the midline
Answer:
Lateral
Explanation:
a sample of CO2 occupies a volume of 280ml at a pressure of 1.3 atm and a temperature of 18 degrees celsius, what volume will the gas occupy at a temp of 35 degrees celsius and a pressure of 3.0 atm
We can calculate the new volume of the gas using the Combined Gas Law:
(P1 x V1) / T1 = (P2 x V2) / T2
The initial volume, pressure, and temperature were 280 mL, 1.3 atm, and 291.15 K (changing the temperature into Kelvin is necessary), and the final volume, pressure, and temperature is V2, 3.0 atm, and 308.15 K. Plugging these values in and solving, we find that:
(P1 x V1) / T1 = (P2 x V2) / T2
(1.3 atm x 280 mL) / 291.15 K = (3.0 atm x V2) / 308.15 K
V2 = 128.42 mL
This makes sense considering the conditions, a small increase in temperature would make the gas expand but a significant increase in the pressure would cause the volume to decrease.
Hope this helps!
Which process describes the movement of molecules from areas of high concentration to areas of low concentration? osmosis solution diffusion homeostasis
It is diffusion.
In a plant it is osmosis but thats not in an area
Solution has honestly got nothing to do with it.
The last one has to do with equilibrium
SO ITS DIFFUSION
:)
Answer: diffusion
Explanation:
Osmosis is defined as the process in which molecules of a solvent tend to move through a semipermeable membrane from a region of low concentration solution to a region of more concentrated solution in a membrane.
Solution is the homogeneous mixture of solute and solvent where solute is the component which is present in smaller proportion and solvent is the component which is present in larger proportion.
Diffusion is defined as the random motion of molecules from areas of higher concentration to lower concentration.
Homeostasis is the active regulation and maintenance of a stable internal physiological state in the face of a changing external environment.
what is located within 10 to 15 km above the earth's surface?
It extends 10 to 15 kilometers (6 to 10 miles) above the earth's surface depending on latitude and time of the year. The troposphere contains most of the atmosphere's water vapor.
The ozone layer is located 10-15 km above the earth's surface.
Describe the ozone layer.The ozone layer, also known as the ozonosphere, is an area of the upper atmosphere that is located between 15 and 35 km (9 and 22 miles) above the surface of the Earth containing a high concentration of ozone molecules (O₃). A fraction of the solar radiation is blocked from reaching the planet's surface by the ozone layer in the stratosphere. It mostly absorbs UVB radiation. Numerous negative consequences, including skin cancer, cataracts, damage to some crops, and harm to marine life have all been associated with UVB.Learn more about the ozone layer here:
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Two examples of energy transformations are shown.
The energy transformations are similar because they both involve transformations
that begin with chemical energy.
begin with electrical energy.
result in radiant energy.
result in mechanical energy.
The energy transformations are similar because they result into radiant energy.
As for the lamp, Electrical energy is transformed into light when the filament
or mercury vapor glows on passage of current.
The fire- chemical energy is turned to light energy during the combustion of carbon. Both products comprise of ultraviolet radiation which is a form of radiant energy.
Answer:
the answer is C
Explanation:
Why does the ocean heat and cool more slowly than the atmosphere?
ANSWER:
its because the ocean has a higher heat capacity.
~batmans wife dun dun dun...aka ~serenitybella
Water is a slow conductor of heat, thus it needs to gain more energy than the sand or dry land in order for its temperature to increase. On the other hand, soil loses its heat much faster. ... Not only do the oceans cover more than 2/3 of the Earth's surface, they also absorb more sunlight and store more heat.
Why are fungi more closely related to animals than they are to plants?
A. animals and fungi are both autotrophs, while plants are heterotrophs
B. animals and fungi are both heterotrophs, while fungi are autotrophs
C. fungi and animals are both heterotrophs, while plants are autotrophs
D. fungi and plants are both autotrophs, while animals are heterotrophs
the answer maybe B or A
Final answer:
Fungi are more closely related to animals than plants because they are both heterotrophs, while plants are autotrophs. Fungi share characteristics such as being heterotrophic, having chitin in their cell walls, and storing carbohydrates as glycogen with animals.
Explanation:
Fungi are more closely related to animals than they are to plants because fungi and animals are both heterotrophs, while plants are autotrophs. Fungi obtain their energy by consuming complex organic compounds from outside sources, similar to animals. Fungi also share other characteristics with animals, such as having chitin in their cell walls and storing carbohydrates as glycogen.
Why does every chemical reaction require a certain amount of activation energy? A. Energy is released when the reactants begin to react. B. Energy lost to the environment during the reaction must be replaced. C. Forming the activated complex requires energy. D. The products have more potential energy than the activated complex. E. The reactants have less potential energy than the products.
Answer: Option (C) is the correct answer.
Explanation:
Activation energy is defined as the minimum amount of energy required for a chemical reaction to start.
An activated complex is also known as transition state where bonds between the reactants are breaking and bonds between the products are forming.
For a chemical reaction, activation energy is required to result in the formation of activated complex.
Therefore, we can conclude that every chemical reaction require a certain amount of activation energy because forming the activated complex requires energy.
Answer:
c
Explanation:
i got it right on plato
how does hair an nails develop
According to google, "As keratin cells naturally push upward through the skin, they die and then harden, turning into your hair or nails."
Mark brainliest if you can! Thanks
17kg of aluminium was produced from 51kg of aluminium oxide (Al2O3) by electrolysis.What was the percentage yield?
Consider this reaction : 2Al2O3 → 4Al + 3O2
The number of moles of Al2O3 can be determined from its mass →
Number of moles of AL2O3 = mass/molar mass
=51/(27x2+16x3)
= 0.5 mol
Now, calculate aluminium's number of moles from the mole ratio →
Mole ratio 4(Al) : 2(Al2O3)
Number of moles of Al = (4/2) x0.5mol = 1 mol
Mass of Al = number of moles x molar mass
= 1x27
= 27kg (theoretical yield)
Given, actual yield = 17kg
Therefore, percentage yield = (actual yield / theoretical yield ) x 100
= (17/27)x100
= 62.96%
Summarize facts about Chemical Change in 2-3 sentences.
A chemical change produces a new substance. When a chemical change takes place, electrons are either given away or received, that’s how you form a bond. Examples on how to identify a chemical change would be, if a gas is produced, precipitate, color change, temperature change. A chemical change can either be endothermic or exothermic.
The atmospheric gases in the thermosphere are heated _____. Pick the best one.
directly by the sun
by the mesosphere
by meteors
by radiation from the Earth's surface
Answer:
A
Explanation:
Final answer:
The gases in the thermosphere are heated directly by the sun, as this layer directly absorbs high energy solar radiation leading to increased temperatures.
Explanation:
The atmospheric gases in the thermosphere are heated directly by the sun. The thermosphere is the layer of the Earth's atmosphere that is directly exposed to the sun's radiation. As solar radiation passes through the atmosphere, shortwave radiation reaches the thermosphere where it is absorbed by the sparse gas molecules present, causing temperatures to rise considerably.
Unlike the lower layers of the atmosphere, such as the troposphere, where heat is primarily transferred from the Earth's surface through longwave radiation, the thermosphere receives its heat directly from the sun, due to the high energy ultraviolet and X-ray solar radiation absorbed by its gases. This direct heating is essential in understanding the thermal dynamics of the upper atmosphere.
Describe the atomic theory of atoms
Answer: Below
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^
Explanation:
The atomic theory is that all matter is made up of tiny units or particles called atoms. This theory describes the characteristics, structure and behavior of atoms as well as the components that make up atoms. Furthermore, the theory states that all elements are made up of identical atoms.
The atomic theory is a theory in the study of chemistry that states atoms are the building blocks of matter. Atoms contain protons, neutrons and electrons. Protons, which have a positive charge, and neutrons are found in the nucleus of the atom. Electrons, which have a negative charge, orbit the nucleus.
According to the atomic theory, all elements contain atoms. The difference is the number of protons, electrons and neutrons in that atom. For instance, hydrogen contains one proton and one electron but no neutrons. Oxygen, on the other hand contains eight protons, electrons and neutrons. The difference in protons, electrons and neutrons determines the stability and the other properties of any particular element. These elements are grouped according to their atomic masses, which depend on the number of protons and neutrons in each of the atoms. Because oxygen has more protons and neutrons than hydrogen, it has a higher atomic mass.
What is the boiling point of CH3CH3
CH3CH3 boils at -88.6°C.
At typical atmospheric pressure (1 atmosphere or 101.3 kPa), the boiling point of [tex]CH_3CH_3[/tex] , commonly known as ethane, is approximately −88.6 °C (−127.5 °F).
Ethane is a simple hydrocarbon composed of two carbon atoms linked by a single covalent link as well as three hydrogen atoms on either side of each carbon atom. At normal room temperature and atmospheric pressure, ethane is a gas.
Ethane has a low boiling point because the intermolecular interactions between its molecules are weak. The London dispersion force, a result of transient variations in electron distribution, holds the ethane molecules together. The boiling point is low because these forces are often less than those of hydrogen bonding or dipole-dipole interactions.
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Write the pressure equilibrium constant expression for this reaction. 2CO2 (g) + 4H2O (g) → 2CH3OH (l) + 3O2 (g)
Answer:
The pressure equilibrium constant (Kp) = (P O₂)³/(P CO₂)²(P H₂O)⁴.
Explanation:
For the reaction:2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g).
The pressure equilibrium constant (Kp) = the product of the pressure of the products side components / the product of the pressure of the reactantss side components.
each one is raised to a power equal to its coefficient.
∴ The pressure equilibrium constant (Kp) = (P O₂)³/(P CO₂)²(P H₂O)⁴.
The pressure equilibrium constant expression for the reaction 2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g) is Kp = (PO₂)³ / (PCO₂)²(PH₂O)⁴, considering only the gases involved, while excluding the liquid CH₃OH from the expression.
The pressure equilibrium constant expression for the reaction 2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g) (g) involves including the partial pressures of gas-phase species and excluding the pure liquids and solids from the expression. According to the rules for writing equilibrium constant expressions, it is given by:
Kp = (PO₂)³ / (PCO₂)²(PH₂O)⁴
However, since CH₃OH is in the liquid phase, it does not appear in the equilibrium expression. Instead, we use the partial pressures of CO₂ and O₂, the gases present in the reaction.
How are magic minerals different from Felsic minerals?
A. Mafic minerals contains lower levels of iron and magnesium.
B. Mafic minerals contain more dark-colored, high-density minerals
C. Mafic minerals contain more light-colored, low-density minerals.
D. Mafic minerals contain higher levels of feldspar and quartz
Answer:
Mafic minerals contain more dark-colored, high-density minerals.
Explanation:
Mefic and felsic minerals represent two kinds of minerals or lava.
For example, mefic lava is more viscous than felsic lava.
The other difference is that word mafic is related to presence of Magnesium and iron minerals more while in felsic (Feldspar) silica content is more.
Mefic minerals are associated with dark color while felsic are lighter in color.
Mafic minerals are dark-colored and high-density due to their higher iron and magnesium content, whereas felsic minerals are light-colored and low-density with higher silica content. The correct answer is B. Mafic minerals contain more dark-colored, high-density minerals.
The key difference between mafic and felsic minerals lies in their chemical composition and resulting physical properties. Mafic minerals are dark-colored and high-density minerals due to their higher iron (Fe) and magnesium (Mg) content and lower silica content. On the contrary, felsic minerals are typically light-colored and low-density, as they contain a higher concentration of silica in the form of quartz and orthoclase feldspar, and are lower in iron and magnesium.
Therefore, the correct answer to the student's question is: Mafic minerals contain more dark-colored, high-density minerals.
Mafic rocks like basalt and gabbro are primarily composed of minerals such as pyroxene and olivine, which contribute to the darker color and higher density, while felsic rocks such as granite and rhyolite are rich in quartz and potassium feldspar, giving them a lighter color and lower density.
What is the volume of 2.1 moles of Cl2 at stop?
= 47.04 L
Explanation;1 mole of a gas at s.t.p occupies a volume of 22.4 liters
Therefore;
2.1 moles of Cl2 will occupy;
2.1 moles × 22.4 L
= 47.04 L
What happens to the mass of a substance during a physical change?
it stays exactly the same
Answer:
During a physical change, items may change, but the mass is the same.
how many moles of oxygen has will occupy a volume of 300ml at 2.7 atm and 40 degrees celsius
We can calculate the amount of Oxygen in this volume using the Ideal Gas Equation, PV = nRT, where "P" is the pressure, "V" is the volume, "n" is the number of moles of material, "R" is the gas constant, and "T" is the temperature in Kelvin. To properly answer this problem, all of the information needs to be converted into the proper units. Fortunately, everything except the volume and temperature is in the correct units for the Ideal Gas Equation; the volume can be adjusted by converting mL to L (x1000) and the temperature can be adjusted by adding 273.15 to the current temperature (conversion from Celsius to Kelvin).
Plugging in all the values, we find that:
PV = nRT
(2.7 atm)(0.3 L) = n(0.0821*)(313.15 K)
n = 0.0315 mol Oxygen
Under these conditions, 0.0315 moles of oxygen can be placed in this volume.
Hope this helps!
* - the units are liters times atmospheres divided by moles times Kelvin.
Thermodynamic PropertiesProperty Value
c (solid) 0.5 J/g °C
c (liquid) 1.0 J/g °C
c (gas) 2.0 J/g °C
Melting Point −114 °C
Boiling Point 78 °C
How much heat is released when 60.0 g of ethanol cools from 70 °C to 43 °C?
Answer:
1,620 J.
Explanation:
The amount of heat added to a substance (Q) can be calculated from the relation:Q = m.c.ΔT.
where, Q is the amount of heat released from ethanol cooling,
m is the mass of ethanol (m = 60.0 g),
c is the specific heat of ethanol in the liquid phase, since the T is cooled below the boiling point and above the melting point (c = 1.0 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 43.0 °C – 70.0 °C = - 27.0 °C).
∴ Q = m.c.ΔT = (60.0 g)(1.0 J/g °C)(- 27.0 °C) = - 1620 J.
The system releases 1620 J.
Answer:
1,600 J
Explanation:
Obama said so