= 0.232 moles
Explanation;Using the ideal gas Law ;
n = PV/RT ; Where, R is the ideal gas constant (0.0821 L atm / K mole), n is the number of moles, P is the pressure, V is the volume and T is the temperature.
V = 0.025 L, T = 22.5 +273 = 295.5 K, P = 225.2 mmHg
n = (225.2 × 0.025)/(295.5 × 0.0821 )
= 0.232 moles
A 200 g sample of water with a temperature of 32◦C is added to 50 g water at 55◦C in an insulated container. What is the final temperature after thermal equilibrium is reached? The specific heat of water in the liquid state is 4.18 J/g◦C, in the solid state is 2.09 J/g◦C, and in the gaseous state is 2.03 J/g◦C. The heat of fusion is 334 J/g and the heat of vaporization is 2260 J/g. 1. 49.2◦C 2. 36.6◦C 3. 52.6◦C 4. 38.4◦C 5. 50.4◦C 6. 43.5◦C 7. 34.1◦C
Final answer:
The final temperature after thermal equilibrium is reached is approximately 46.6°C.
Explanation:
To find the final temperature after thermal equilibrium is reached, we can use the principle of conservation of energy. The heat gained by the cool water is equal to the heat lost by the hot water.
Let's denote the final temperature as T. The heat gained by the cool water can be calculated using the equation q = m * c * ΔT, where q is the heat gained, m is the mass of the cool water, c is the specific heat of water, and ΔT is the change in temperature. The heat lost by the hot water can be calculated using the same equation. Setting the two equations equal to each other and solving for T will give us the final temperature.
Using the given values, we can calculate:
qcool = (200 g) * (4.18 J/g°C) * (T - 32°C)
qhot = (50 g) * (4.18 J/g°C) * (55°C - T)
Setting qcool equal to qhot:
(200 g) * (4.18 J/g°C) * (T - 32°C) = (50 g) * (4.18 J/g°C) * (55°C - T)
Simplifying and solving for T:
800(T - 32°C) = 50(55°C - T)
T = 46.6°C
Therefore, the final temperature after thermal equilibrium is reached is approximately 46.6°C.
what kind of solid often has the highest melting points?
A.) solids made of nonpolar molecules
B.) solids made of atoms
C.) solids made of ionic bonds
D.)solids made of polar molecules
B solids made of atoms
Solids with the highest melting points are typically those with either covalent networks or ionic bonds, due to the strength of their atomic or ionic interactions. So the correct option is C.
Explanation:The type of solid that often has the highest melting points are those made of atoms arranged in a covalent network or those formed by ionic bonds. Solids that consist of ionic bonds, such as sodium chloride (NaCl), typically have high melting points due to the strong electrostatic interactions between the positively and negatively charged ions within a crystal lattice. Similarly, materials with a covalent network, like diamond or silicon dioxide (SiO2), have very high melting points because they consist of a three-dimensional array of covalently bonded atoms that require a lot of energy to break apart. In contrast, molecular solids composed of nonpolar or polar molecules have lower melting points due to their weaker intermolecular forces, such as London dispersion forces, dipole-dipole interactions, and in some cases, hydrogen bonding.
Three metal spheres are placed next to each other as shown in the picture. A has two times the mass of B. C has one-third the mass of A. The distance between A and C is half that between A and B. Given these conditions, which statement is true?
You didn’t list the statements.
Answer:
The answer is C. I just had this question.
Explanation:
Calculate the molarity of a solution in which 212.5g of NaNO3 are contained in 3.0 liters of solution.
Molarity's formula is: moles solute/liters solution.
In this question, we are given grams of solute so we have to convert that to moles.
NaNO3 has a molar mass of 84.9947g/mol. Here we begin with the given 212.5g and multiplying it by 1mol/84.9947g because the grams have to cancel out to give moles.
[tex](212.5 grams NaNO3)/(\frac{1 mole NaNO3}{84.9947 grams NaNO3} ) =2.5 moles NaNO3[/tex]
Now that we have moles of solute, we just plug it into the formula.
2.5 mols NaNO3/3L solution=0.8333 M of solution
The molarity of the solution containing 212.5 g of NaNO₃ in 3 L of solution is 0.83 M
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of NaNO₃ Mass of NaNO₃ = 212.5 g Molar mass of NaNO₃ = 23 + 14 + (3×16) = 85 g/mol Mole of NaNO₃ =?Mole = mass / molar mass
Mole of NaNO₃ = 212.5 / 85
Mole of NaNO₃ = 2.5 mole
How to determine the molarity Mole of NaNO₃ = 2.5 mole Volume = 3 L Molarity =?Molarity = mole / Volume
Molarity = 2.5 / 3
Molarity = 0.83 M
Learn more about molarity:
https://brainly.com/question/15370276
#SPJ2
How did Mendeleev feel about Russian science education when he came back from Germany
As he began to teach inorganic chemistry, Mendeleev could not find a textbook that met his needs. Since he had already published a textbook on organic chemistry in 1861 that had been awarded the prestigious Demidov Prize, he set out to write another one. The result was Osnovy khimii (1868–71; The Principles of Chemistry), which became a classic, running through many editions and many translations. When Mendeleev began to compose the chapter on the halogen elements (chlorine and its analogs) at the end of the first volume, he compared the properties of this group of elements to those of the group of alkali metals such as sodium. Within these two groups of dissimilar elements, he discovered similarities in the progression of atomic weights, and he wondered if other groups of elements exhibited similar properties. After studying the alkaline earths, Mendeleev established that the order of atomic weights could be used not only to arrange the elements within each group but also to arrange the groups themselves. Thus, in his effort to make sense of the extensive knowledge that already existed of the chemical and physical properties of the chemical elements and their compounds, Mendeleev discovered the periodic law.
Dimitri Mendeleev was the most noted Russian chemist who gave the periodic table. He gave the periodic table based on the atomic numbers and how they characterized the physical and chemical properties of the elements.
What were the thoughts of Mendeleev?When he came back to his homeland he began teaching inorganic chemistry but was not able to find a suitable textbook according to his need. He thought of writing another book as he was already awarded the prestigious Demidov Prize.As the result, he published the Principles of chemistry which is the most noted work of his and was translated to many languages.When he was studying the alkali group metals then he discovered that the properties according to the atomic numbers can be used to arrange the elements within themselves and in other groups.Therefore, he discovered the periodic table.
Learn more about Mendeleev here:
https://brainly.com/question/1846814
If the experiments data does not support the hypothesis what would a scientist do next?
A. Question their ability to be a scientist.
B. Discard the entire experiment as irrelevant.
C. Conclude the opposite of the hypothesis.
D. Ask more questions based on learning something from this experiment.
Ask more questions based on learning something from this experiment.
hope this helps :)
HELP When 400 J of heat is added to 5.6 g of olive oil at 23*C, the temperature increases to 87*C. What is the specific heat of the olive oil? (Show all work including the equation you use to solve). (3 points).
Q=mc*temperature change
400=5.6/1000*c*(87-23)
c=1160.07J/kg/k
how human activity can affect the carbon cycle
Answer:
Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.
Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone.
What is carbon cycle?The flow of carbon on earth in its elemental and mixed phases is represented by the carbon cycle. The elemental kinds of carbon are diamond and graphite, and when they are mixed, they are found as carbonates throughout minerals as well as carbon dioxide gases throughout the atmosphere. Carbon is returned to the atmosphere as plants and animals perish and are degraded.
Plants use carbon from the atmosphere to produce photosynthesis. Animals eat these plants, which causes carbon to bioaccumulate in their bodies. Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone. The carbon cycle is greatly impacted by human activity.
Therefore, significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone.
To know more about carbon cycle, here:
https://brainly.com/question/13729951
#SPJ5
All of these may be classified as
What is it that you’re asking for?
Answer:
Where is the chart
Explanation:
Explain why the temperature of ocean water will vary with latitude and depth.
The latitude changes the climate, so if the ocean water is in the Antarctic Ocean, it will most likely be cold. The depth of the ocean water matters because it determines the amount of sunlight that the water receives therefore heating it.
Which is an example of a pure substance? A. coffee B. helium C. vinegar D. trail mix
B. Helium
It has only He atoms
What is the Bronsted-Lowry definition of an acid?
Which of the following statements is correct in regards to density?
A-Pressure is directly proportional to density.
B-Pressure is inversely proportional to density.
C-Temperature is directly proportional to density.
D-Temperature and pressure do not affect density.
A is the answer i dont really know but i think is right
Answer : The correct option is, (A) Pressure is directly proportional to density.
Explanation :
Density : It is defined as the mass contained per unit volume.
Formula used for density :
[tex]Density=\frac{Mass}{Volume}[/tex]
From this we conclude that, the density depends on mass and volume of substance.
The density is directly proportional to the mass of substance and inversely proportional to the volume of substance.
[tex]Density\propto \frac{1}{Volume}[/tex]
And as we know that, the volume is also depends on pressure and temperature. That means,
Volume is directly proportional to the temperature and inversely proportional to the pressure.
[tex]Volume\propto Temperature\\\\Volume\propto \frac{1}{Pressure}[/tex]
From this we conclude that,
The relation between the density, volume and pressure is:
[tex]Density\propto \frac{1}{Volume}\propto Pressure[/tex]
The relation between the density, volume and temperature is:
[tex]Density\propto \frac{1}{Volume}\propto \frac{1}{Temperature}[/tex]
From the given option, only option A is correct option. While the other options are incorrect.
Hence, the correct option is A.
What are the mountainous parts of the moon called? Question 3 options: craters terrae maria regolith
Answer:
Terrae
Explanation:
The mountainous parts of the moon are referred as Terrae. These are bright regions on the moon. Most of the surface of the moon is covered these highlands.
Craters are the depressions created on the surface of the moon as the space rocks strike.
Maria are the dark areas on the surface of the moon. These areas are filled with solidified lava.
Regolith constitutes the upper loose layer of soil, dust, broken rocks and other materials.
Which of the following is a possible set of quantum numbers for an electron?
(1, 1, 0, +½)
(2, 1, 2, +½)
(3, 2, 0, -½)
(3, -2, 1, -½)
answer is one first one for one electron.
I don’t know it A is correct please tell me the right answer
I do believe the answer is A. Hope this helps.
I think A would be the correct answer
what is burning in chemistry.
Fire is burning, which is combustion, and combustion is a type of oxidation reaction. Oxidation means combined chemically with oxygen . Oxidation is an exothermic reaction, meaning it gives releases heat energy.
for a is burning. which is combustion and that is a type of oxidation means to combine chemically with oxygen.
A chemist is using a solution of HNO3 that has a pH of 3.75. What is [H+] for the solution? 1.78 × 10n M n =
Answer:
The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].
Explanation:
The pH of the solution is defined as negative logarithm of [tex]H^+[/tex] ion concentration.
[tex]pH=-\log[H^+][/tex]
The pH of the nitric acid solution = 3.75
[tex]3.75=-\log[H^+][/tex]
[tex][H^+]=Antilog [-3.75]=0.0001778=1.778\times 10^{-4} M[/tex]
The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].
Answer:
1st Question: 1.78 / -4
2nd Question: A
Explanation:
Source: Dude trust me
A radioactive isotope has a half-life of 10 years. What fraction of the original mass will remain unchanged after 50 years
The fraction is calculated like this:
[tex] \frac{1}{ {2}^{50 \div 10} } = \frac{1}{32} [/tex]
If you want an universal equation for all problems like this:
[tex] \frac{1}{ {2}^{time \div halflife} } [/tex]
The fraction of the original mass of the radioactive isotope with a half-life of 10 years that will remain after 50 years is 1/32.
We can find the fraction of the original mass with the exponential decay equation:
[tex] N(t) = N_{0}e^{-\lambda t} [/tex] (1)
Where:
N(t): is the amount of radioactive isotope at time t
N₀: is the initial amount of radioactive isotope
λ: is the decay constant
t: is the time = 50 y
We can find the decay constant as follows:
[tex] \lambda = \frac{ln(2)}{t_{1/2}} [/tex] (2)
Where:
[tex]t_{1/2}[/tex]: is the half-life of the isotope = 10 y
The decay constant is (eq 2):
[tex] \lambda = \frac{ln(2)}{t_{1/2}} = \frac{ln(2)}{10 y} = 0.069 y^{-1} [/tex]
Now, the fraction of the original amount is (eq 1):
[tex] \frac{N(t)}{N_{0}} = e^{-\lambda t} = e^{-0.069 y^{-1}*50 y} = 0.0317 [/tex]
Since we need to calculate the fraction of the original mass, after some algebraic operations we have:
[tex] \frac{N_{0}}{N(t)} = 32 [/tex]
[tex] N(t) = \frac{1}{32}N_{0} [/tex]
Therefore, the fraction of the original mass that will remain is 1/32.
Find more here:
https://brainly.com/question/4318844?referrer=searchResultshttps://brainly.com/question/14020364?referrer=searchResultsI hope it helps you!
How many grams of N2 are required to make 75 grams of NH3?
Answer:
2.138 I think
Explanation:
N2 + 3H2 -> 2NH3
This means that 3 moles of H2 gives 2 moles of NH3
Lets convert 12.12 g of NH3 into moles.
The molecular weight of NH3 is 17 g/mol
So 12.12 g is 0.713 moles
If 2 NH3 comes from 3 moles of H2
1 mole comes from 1.5 moles of H2
So 0.713 moles of NH3 comes from 1.5 x 0.713 moles of H2 =1.069 moles of H2
1 mole of H2 weights 2g
So 1.069 moles of H2 weighs 2.138 g
Nitrogen and oxygen are _____ gases in the atmoshere.
Trace
Variable
Primary
Rare
Nitrogen and oxygen are primary gases in the atmosphere.
Trace
Variable
Primary
Rare
They are he Primary gasses in the atmosphere with the percentages being 78% nitrogen, 21% oxygen
hope this has helped
Consider the following equilibrium reaction having gaseous reactants and products. 4HCl + O2 ⇌ 2H2O + Cl2 Which of the following would result from increasing the volume of oxygen?
B.The rate of forward reaction increases.
Explanation;Le Chatelier's principle states that changing a factor such as concentration, temperature, or pressure of a reaction at equilibrium will cause the reaction to shift in the direction that counteracts the effect of that change.Therefore, when reactants are added to a reaction at equilibrium shift when more reactants are added then the reaction shifts to the right to make more products.Answer: B) The rate of forward reaction increases.
Beginning with commercial grade hydrochloric acid, 1.00 • 10^2 mL of a 12.4 M HCl is added to water to bring the total volume if the solution to 0.820L. What is the concentration of this new solution?
Find the concentration of H+ ions at a pH = 11 and
pH = 6. Then divide the concentration of H+ ions at a
pH = 11 by the of H+ ions at a pH = 6. Record your answer in Table C.
What is the concentration of H+ ions at a pH = 11?
mol/L
What is the concentration of H+ ions at a pH = 6?
mol/L
How many fewer H+ ions are there in a solution at a
pH = 11 than in a solution at a pH = 6?
Answer:
for table C
Explanation:
What is the concentration of H+ ions at a pH = 11?
1. ⇒ 0.00000000001 mol/L
What is the concentration of H+ ions at a pH = 6?
2. ⇒ 0.000001 mol/L
How many fewer H+ ions are there in a solution at a
pH = 11 than in a solution at a pH = 6?
3. ⇒ 100,000
The concentration of H+ ions at pH 11 is 1.0 x 10^-11 mol/L and at pH 6 is 1.0 x 10^-6 mol/L. There are 100,000 times fewer H+ ions at a pH of 11 than at a pH of 6.
Explanation:The concentration of H+ ions in a solution can be calculated using the pH value, which is the negative logarithm (base 10) of the hydrogen ion concentration. Therefore, pH = -log[H+], and to find [H+], we can use the inverse logarithmic relationship: [H+] = 10^-pH.
For a solution with a pH of 11, the concentration of H+ ions would be: [H+] = 10^-11 mol/L, which equals 1.0 x 10^-11 mol/L.
For a solution with a pH of 6, the concentration of H+ ions would be: [H+] = 10^-6 mol/L, which equals 1.0 x 10^-6 mol/L.
To find how many fewer H+ ions are in a solution with a pH of 11 compared to a pH of 6, we divide the two concentrations: (1.0 x 10^-11 mol/L) / (1.0 x 10^-6 mol/L) = 1.0 x 10^-5. This means that the solution with a pH of 11 has 100,000 times fewer H+ ions than the solution with a pH of 6.
Learn more about H+ ion concentration here:https://brainly.com/question/32978004
#SPJ3
how are cations formed
cations are formed when a metal loses electrons, and a nonmetal gains those electrons.
how to find the number of neutrons in an atom
You can find the number of neutrons in an atom by subtracting the atomic number from the mass number.
How to find the number of neutrons ?The mass number of an atom is the total number of protons and neutrons in the nucleus of the atom. The atomic number of an atom is the number of protons in the nucleus of the atom. Both the mass number and the atomic number can be found on the periodic table of elements.
To find the number of neutrons in an atom therefore, you can use the following formula:
Number of neutrons = Mass number - Atomic number
Find out more on neutrons at https://brainly.com/question/26952570
#SPJ1
Use the conservation of mass to explain why a rusty nail weighs more than the original nail.
Elements in the same group have _____.
a. the same number of electron shells
b. the same number of protons
c. similar chemical properties
d. the same number of isotopes
Similar chemical properties
(OPTION C)
Answer:
similar chemical properties
Explanation:
i can confirm his answer
what effect does a decrease in temperature have on the overall rate of a chemical reaction??
A decreased in temperature decreases ( BLANK A). The reaction rate will ( BLANK B).
choices for Blank A:
A. the activation energy of the reaction.
B. the number of collisions between molecules.
C. the number of products in the mixture.
CHOICES FOR BLANK B:
A. decrease
B. increase
C. remain constant
Change in temperature affects the rate of reaction since it causes a change in the number of collisions per unit time. These collisions cause the breaking of bonds and formation of new ones giving out new products. An increase in temperature increases the rate of collisions hence increasing the rate of reaction while a decrease in temperature leads to a decrease in the rate of reaction due to the decreased number of collisions per unit time. thus the correct choice for blank A is: B. the number of collisions between molecules and for blank B: decrease.
Answer:
A decrease in temperature changes "the number of collisions between molecules. The reaction rate will decrease.
Blank A: "the number of collisions between molecules.
Blank B: decrease.
An increase in temperature causes a rise in the energy levels of the molecules involved in the reaction, so the rate of the reaction increases. Similarly, the rate of reaction will decrease with a decrease in temperature.
How quickly or slowly a substance heats or cools is measured by its
Specific Heat is the measure that how quickly or slowly a substance heats or cools.
What is Specific Heat ?Specific Heat is defined as the amount of required to raise the temperature of a substance by 1 degree Celsius.
The units of specific heat are usually calories or joules per gram per Celsius degree.
Specific Heat for water is 1 cal/gm /degree Celsius
Specific Heat is the measure that how quickly or slowly a substance heats or cools.
To know more about Specific Heat
https://brainly.com/question/11297584
#SPJ2