Answer:
40 mL
Step-by-step explanation:
The pressure is constant.
The only variables are volume and temperature, so we can use Charles’ Law.
V₁/T₁ = V₂/T₂ Multiply each side by T₂
V₂ = V₁ × T₂/T₁
V₁ = 30 mL; T₁ = 273 K
V₂ = ?; T₂ = 364 K
V₂ = 30 × 364/273
V₂ = 40 mL
The term “ average atomic mass “ is a ______average so is calculator different Lee from a normal average
Average atomic mass of an element is a sum of the product of the isotope mass and its relative abundance.
For example: Chlorine has 2 isotopes with the following abundances
Cl(35): Atomic mass = 34.9688 amu; Abundance = 75.78%
Cl(37): Atomic mass = 36.9659 amu; Abundance = 24.22 %
Average atomic mass of Cl = 34.9688(0.7578) + 36.9659(0.2422) =
= 26.4993 + 8.9531 = 35.4524 amu
Thus, the term “ average atomic mass “ is a weighted average so it is calculated differently from a normal average
an air sample consists of 99.6% of nitrogen-14 and 0.4% of nitrogen-15. what is the average mass of nitrogen in this sample?
The average mass of nitrogen is 14
calculation
step 1 : multiply each percentage by mass number
14 x 99.6 =1394
15 x 0.4 = 6
Step 2: add them up
1394 + 6 = 1400
step 3: Then divide by 100
= 1400/100 = 14
Answer:The average atomic mass of nitrogen is 14.004
Explanation:
Abundance of nitrogen-14 = 99.6 %
Fractional abundance[tex]=\frac{99.6}{100}=0.996[/tex]
Abundance of nitrogen-15 = 0.4 %
Fractional abundance[tex]=\frac{0.4}{100}=0.004[/tex]
Average atomic mass of an element =
[tex]\sum(\text{atomic mass of an isotopes}\times (\text{fractional abundance}))[/tex]
Average atomic mass of nitrogen =
[tex]14\times 0.996+15\times 0.004amu=14.004[/tex]
The approximate atomic mass of nitrogen is 14.004
The requirements of atoms to be able to participate in hydrogen bonding with a hydrogen atom include all of the following except A. atoms must not be able to closely approach the hydrogen. B. atoms must be electronegative. C. atoms must have one lone pair of electrons. D. atoms must be small.
B. atoms must be electro negative.
Answer:
The answer is A.
Explanation:
This is a specific type of polar interaction that is established between two atoms with high electronegativity, usually between O or N, and an atom of H. In the case of oxygen, with a total of 8 electrons, two pairs of solitary electrons are presented and can act as acceptors of two hydrogen bridges. Nitrogen has one less electron and therefore has only one pair of solitary electrons to form a hydrogen bridge. These orbitals have a high negative charge density, and can, therefore, bind to the positive charge of hydrogen.
The interatomic distance between the hydrogen and the acceptor is less than the sum of its Van der Waals radius. The atomic radius of N and O are relatively small.
Have a nice day!
What air moves horizontally or parallel to the ground?
Wind, air that moves to the ground
What is the volume of 7.25 g of oxygen gas at STP?
Answer:
5.15 L
Step-by-step explanation:
This looks like a case where we can use the Ideal Gas Law to calculate the volume.
pV = nRT Divide both sides by p
V = (nRT)/p
Data:
m = 7.25 g
R = 0.083 14 L·atm·K⁻¹mol⁻¹
T = (0 +273.15) K = 273.15K
p = 1 bar (Note: STP is 1 bar and 0°C)
Calculations:
(a) Moles of O₂
n = m/M
n = 7.25/32.00
n = 0.2266 mol
(b) Volume
V = (0.2266 × 0.083 14 × 273.15)/1
V = 161.3/2.00
V = 5.15 L
The volume of 7.25 g oxygen gas at STP has been 5.075 L.
The oxygen has been assumed to be an ideal gas. The volume of 1 mole of an ideal gas at STP has been 22.4 L.
Volume of Oxygen at STPThe moles of a gas has been given as:
[tex]\rm Moles=\dfrac{Mass}{Molar\;mass}[/tex]
The given mass of oxygen has been 7.25 g.
The molar mass of oxygen has been 32 g.
The moles of oxygen gas have been given as:
[tex]\rm Moles\;O_2=\dfrac{7.25}{32}\\Moles\;O_2= 0.226\;mol[/tex]
The moles of oxygen available has been 0.226 mol.
The volume of 0.226 mole oxygen at STP has been:
[tex]\rm 1\;mol=22.4\;L\\0.226\;mol=0.226\;\times\;22.4\;L\\0.226\;mol=5.075\;L[/tex]
The volume of 7.25 g oxygen gas at STP has been 5.075 L.
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why is the fact that light travels at 300,000 km/s is a consequence of energy conservation?
Light traveling at a constant speed is a consequence of the conservation of energy and is embodied in Einstein's equation E = mc^2. This speed limit contributes to the principles of energy and mass-energy conservation, with implications for relativistic phenomena like time dilation and length contraction.
Explanation:The fact that light travels at 300,000 km/s is a consequence of the conservation of energy. This principle is embodied in Einstein's famous equation E = mc2, where E denotes energy, m denotes mass, and c denotes the speed of light. This equation suggests that mass and energy are interchangeable.
According to the theory of relativity, if an object with mass attempted to reach the speed of light, it would require infinite energy, which is physically impossible. Therefore, the speed of light is a universal speed limit. This limit contributes to the principle of energy conservation and the closely related concept of mass-energy conservation.
Further consequences of the speed of light include time dilation, length contraction, and increased momentum as objects approach this speed. Equivalently, if a mass could reach the speed of light, these effects suggest that it would convert into pure energy, again consistent with E = mc2 and the conservation of mass-energy.
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Answer the following for the reaction: 3AgNO3(aq)+Na3PO4(aq)→Ag3PO4(s)+3NaNO3(aq)
1. How many milliliters of a 0.255 MAgNO3 solution are required to react with 31.1 mL of 0.135 MNa3PO4 solution?
2. How many grams of silver phosphate are produced from the reaction of 23.0 mL of a 0.195 MAgNO3 solution and excess Na3PO4?
Answer:1) Volume of [tex]AgNO_3[/tex] required is 55.98 mL.
2) 0.62577 grams of [tex]Ag_3PO_4[/tex] is produced.
Explanation:
[tex]3AgNO_3(aq)+Na_3PO_4(aq)\rightarrow Ag_3PO_4(s)+3NaNO_3(aq)[/tex]
1) Molarity of [tex]AgNO_3,M_1=0.225 M[/tex]
Volume of [tex]AgNO_3.V_1=?[/tex]
Molarity of [tex]Na_3PO_4,M_2=0.135 M[/tex]
Volume of [tex]Na_3PO_4,V_2=31.1 mL=0.0311 L[/tex]
[tex]Molarity=\frac{\text{number of moles}}{\text{volume of solution in liters}}[/tex]
[tex]\text{number of moles }Na_3PO_4=M_2\times V_2=0.135 mol/L\times 0.0311 L=0.0041985 moles[/tex]
According to reaction, 1 mole of [tex]Na_3PO_4[/tex] reacts with 3 mole of [tex]AgNO_3[/tex], then, 0.0041985 moles of [tex]Na_3PO_4[/tex] will react with:
[tex]\frac{3}{1}\times 0.0041985[/tex] moles of [tex]AgNO_3[/tex] that is 0.0125955 moles.
[tex]M_1=0.225 M=\frac{\text{number of moles of }AgNO_3}{V_1}[/tex]
[tex]V_1=\frac{0.0125955 moles}{0.225 M}=0.05598 L=55.98 mL[/tex]
Volume of [tex]AgNO_3[/tex] required is 55.98 mL.
2)
[tex]Molarity=0.195 M=\frac{\text{number of moles}}{\text{volume of solution in liters}}[/tex]
Number of moles of [tex]AgNO_3=0.195\times 0.023 L=0.004485 moles[/tex]
According to reaction, 3 moles of [tex]AgNO_3[/tex] gives 1 mole of [tex]Ag_3PO_4[/tex], then 0.004485 moles of [tex]AgNO_3[/tex] will give:[tex]\frac{1}{3}\times 0.004485[/tex] moles of [tex]Ag_3PO_4[/tex] that is 0.001495 moles.
Mass of [tex]Ag_3PO_4[/tex] =
Moles of [tex]Ag_3PO_4[/tex] × Molar Mass of [tex]Ag_3PO_4[/tex]
= 0.001495 moles × 418.58 g/mol = 0.62577 g
0.62577 grams of [tex]Ag_3PO_4[/tex] is produced.
If you drop a 25-gram piece of metal that has a temperature of 100° Celsius into 1000 grams of water at 20° Celsius, what best describes what would occur?
1. the temperature lost by the metal will equal the temperature gained by the water
2. the heat lost by the metal will equal the heat gained by the water
3. the final temperature will be 60 degrees celsius
4. the final temperature will be more than 60 degrees celsius
Answer is: 2. the heat lost by the metal will equal the heat gained by the water.
1) the temperature lost by the metal will equal the temperature gained by the water is not correct, because temperature is the intensity of heat present in a substance and a thermometer is a device that measures temperature or a temperature gradient.
3) the final temperature will be 60 degrees celsius is not correct, because amount of water is greater than amount of metal, so the the final temperature will be less than 60 degrees celsius.
4) same as 3).
How do nonmetals conduct electricity? well . by giving up electrons . poorly . better than metals.
Usually poorly, especially at room temperature for most of them. The gases do not conduct. Some that are marginally non metals (silicon germanium and graphite) conduct passably well but do not conduct as well as copper or silver.
Non metals do not have easily freed electrons and that is why they do not conduct electricity.
1) Give a detailed explanation of how you can use the laboratory technique of titration to determine the concentration of an acetic acid solution.
2) When a reaction is reversible, eventually the rates of the forward and reverse actions will be equal. Which of the following best explains what this means?
The concentrations of the reactants and products have become equal.
The concentrations of the reactants have become constant.
The concentrations of the reactants have not reacted well.
The concentrations of the reactants have completed their reaction.
3) Balance the following redox equation and identify the element oxidized, the element reduced, the oxidizing agent, and the reducing agent. Show all of the work used to solve the problem. (5 points)
NO2- + Al yields AlO2- + NH3
1) Answer is: Determine the endpoint of titration.
The endpoint is the point at which the indicator changes colour in a colourimetric titration and that is point when titration must stop.
Equivalence point is the point which there is stoichiometrically equivalent amounts of acid and base.
Chemist can draw pH curve (graph showing the change in pH of a solution, which is being titrated) for titration and determine equivalence point.
This is example of acid-base titration.
a) measure volume and molarity of some strong base, for example sodim hydroxide (NaOH).
b) measure the volume of acetic acid into a beaker.
c) titrate until the endpoint is reached, when the colour of indicator, for example phenolphthalein changes color.
d) Use balanced chemical reaction of acetic acid and sodium hydroxide:
CH₃COOH(aq) + NaOH(aq) → CH₃COONa(aq) + H₂O(l). From molarity and volume of base determine the concentration of acetic acid.
2) Answer is: The concentrations of the reactants have become constant.
For example, balanced chemical reaction: 2CH₄(g) ⇄ C₂H₂(g) + 3H₂(g).
a) In a chemical reaction, chemical equilibrium is the state in which both reactants (methane CH₄) and products (ethyne C₂H₂ and hydrogen H₂) are present in concentrations which have no further tendency to change with time.
b) At equilibrium, both the forward and reverse reactions are still occurring.
c) Reaction rates of the forward and backward reactions are equal and there are no changes in the concentrations of the reactants and products.
3) Chemical equation: NO₂⁻ + Al → AlO₂⁻ + NH₃.
Oxidation half reaction: Al⁰ + 4OH⁻ → AlO₂⁻ + 2H₂O + 3e⁻ /×2.
Reduction half reaction: NO₂⁻ + 5H₂O + 6e⁻ → NH₃ + 7OH⁻.
Oxidation half reaction: 2Al⁰ + 8OH⁻ → 2AlO₂⁻ + 4H₂O + 6e⁻.
Reduction half reaction: NO₂⁻ + 5H₂O + 6e⁻ → NH₃ + 7OH⁻.
Balanced chemical equation:
2Al + 8OH⁻ + NO₂⁻ + 5H₂O → 2AlO₂⁻ + 4H₂O + NH₃ + 7OH⁻.
The same species on opposite sides of the arrow can be canceled:
2Al + OH⁻ + NO₂⁻ + H₂O → 2AlO₂⁻ + NH₃.
Aluminium is oxidized (change oxidation number from 0 to +3) and nitrogen is reduced (change oxidation number from +3 to -3).
Aluminium is reducing agent (lost electrons) and nitrogen is oxidizing agent (gain electrons).
Which equation is NOT balanced? a. 2H2 + O2 → 2H2O c. Fe2O3 + 3H2 → 2Fe + 3H2O b. 4NH3 + 5O2 → 4NO + 6H2O d. 3H2 + 2O2 → 2H3O
option d
the values are wrong on the right hand side of the equation, the right equation is above a,b,c.
The chemical equation that is NOT balanced is option d, which has an unequal number of atoms on the reactant and product sides.
To determine if a chemical equation is balanced, we must check that the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side. Comparing the given equations:
a. 2H₂ + O₂ → 2H₂O: This equation is balanced because there are 4 hydrogen atoms and 2 oxygen atoms on both sides of the equation.c. Fe₂O₃ + 3H₂ → 2Fe + 3H₂O: This equation is also balanced, with 2 iron atoms, 3 oxygen atoms, and 6 hydrogen atoms on each side.b. 4NH₃ + 5O₂ → 4NO + 6H₂O: This equation is balanced when we count the nitrogen, oxygen, and hydrogen atoms.d. 3H₂ + 2O₂ → 2H₃O: This equation is NOT balanced because there are 6 hydrogen atoms on the reactant side but 6 hydrogen atoms and an extra oxygen atom on the product side.Thus, option d is the equation that is not balanced.
Early models of our solar system were usually based on experimentation
the best science of the time
the discoveries
of the best scientists
philosophy and religion
Based on the question and the given data, philosophy and religion.
Which of the following reactions could be used to power a battery because of the transfer of electrons?
Pb22+ + 2Br− → PbBr
CaCl2 + 2NaOH → Ca(OH)2 + 2NaCl
KOH + HCl → KCl + H2O
Zn + Cu2+ → Zn2+ + Cu
Answer is: Zn + Cu2+ → Zn2+ + Cu.
In this chemical reaction, there is transfer of electrons from zinc (Zn) to copper (Cu). Zinc change oxidation number from 0 to +2 (lost electrons) and copper change oxidation number from +2 to 0 (gain electrons).
Oxidation half reaction: Zn⁰ → Zn²⁺ + 2e⁻.
Reduction half reaction: Cu²⁺ + 2e⁻ → Cu⁰.
In other chemical reactions, there is no change of oxidation number of elements.
What is the number if electrons in the outermost energy level of an oxygen atom?
2
8
4
6
6 is the number of electrons in the outermost energy level of an oxygen atom.
So the correct answer would be six.
Hope this helps,
Davinia.
Structural formulas are like models because they show _[blank]_.
Which answer best completes this statement?
a condensed way of writing a compound
how elements arrange within a compound
how electrons arrange within a compound
the three-dimensional shape of a compound
The correct option is:
how elements arrange within a compound
Structural formula are like models because they show how elements arrange within a compound.
What is the symbol for an isotope of carbon with 7 neutrons?
C-13. 6 protons 7
neutrons.
Which of the following is a noncontact force?
A.
magnetic forces
B.
electrical forces
C.
gravitational forces
D.
all of these
Is Fe2O3+H2--2Fe+3H2O balanced or unbalanced?
hydrogen is not balanced
the right balanced equation is
Fe2O3 + 3 H2 -> 2Fe + 3H2O
A child is male because he has one X chromosome and one Y chromosome where did these chromosomes come from
it would come from your mom and dad
What is the Lewis structure for H2Se
Which of the following types of electromagnetic waves has a frequency greater than ultraviolet waves?
A) X rays
B) infrared waves
C) microwaves
D)visible light
Answer:
A) X-rays
Step-by-step explanation:
Ultraviolet rays have a frequency range of 10¹⁵ Hz to 10¹⁷ Hz.
X-rays have a frequency range of 10¹⁷ Hz to 10²⁰ Hz, so they have a higher frequency than UV waves.
B) is wrong. The frequency range of infrared light is 10¹³ Hz to 4 × 10¹⁴ Hz.
C) is wrong. The frequency range of microwaves is 3 ×10¹¹ Hz to 10¹³ Hz.
D) is wrong. The frequency range of microwaves is 4 ×10¹⁴ Hz to 7.5 × 10¹⁴ Hz.
The X-rays has a frequency greater than ultraviolet waves.
• The range of all the kinds of electromagnetic radiation is known as the electromagnetic spectrum.
• The types of the electromagnetic waves, which makes up the electromagnetic spectrum are the visible light, microwaves, infrared light, UV rays, X-rays, and gamma rays.
• The energy of the waves is directly proportional to its frequency and inversely proportional to their wavelengths.
• The radiowaves exhibits the photons with least energies, followed by microwaves, infrared rays, visible, UV rays, X-rays, and the most energetic of all the waves is the gamma rays.
• The wavelengths of the UV rays is smaller than infrared waves, microwaves, and visible light, however, it is greater than X-rays and gamma rays.
• Thus, the frequencies of UV rays is more than the infrared waves, microwaves, and visible light, but is lesser than the frequencies of X-rays and gamma rays.
Thus, of the mentioned options, X-rays will possess greater frequency than UV rays.
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Which two factors does the power if a machine depend on
A. work and distance
B. force and distance
C. work and time
D. time and distance
The definition of mechanical power is
Power = (work done) / (time to do the work).
From that definition, it looks pretty much like the power of a machine
depends on work and time.
Answer:
c. work and time
Explanation:
c is right on plato
what is a chemical change?
Chemical change accurs when a substance changes form like liquid to solid.
A _____ is a mountain created from eruptions of lava, ash, rocks, and hot gases.
Valcano i your answer i believe
Abdid is an astronomer who has been observing objects that orbit the sun in the Astro belt . He finds a previously undiscovered round rocky object that is not similar in shape to the rest of the asteroids what has abdid most likely found
Since it is round, and in the asteroid belt, he has most likely found a Dwarf planet. This is because it is round, so it might be round because of it's gravity.
Answer:
A. a new dwarf planet
Explanation:
Please fill out all of table!!
1) Alkali metals - s block; one valence electron; lose one valence electron; charge of an ion +1.
Alkali metals have electronegativity from 0.7 to 1, lowest in Periodic table of elements, which means that alkali metals (I group in Periodic table) has positive oxidation number in compounds.
Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
For example, sodium (Na) is an element with atomic number 11 and it has one valence electron (3s¹) like all alkaline metals.
Electron configuration of sodium atom: ₁₁Na 1s² 2s² 2p⁶ 3s¹.
2) Alkaline earth metals - s block; two valence electrons; lose two electrons; charge of an ion is +2.
Beryllium, magnesium,calcium and strontium are alkaline earth metals. The elements have very similar properties. Alkaline earth metals have in common an outer s- electron shell (two electrons).
For example, atomic number of calcium is 20, it means that it has 20 protons and 20 electrons, so atom of calcium is neutral.
Electron configuration of calcium atom: ₂₀Ca 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²; calcium has two valence electrons (4s²).
3) Boron group - p block; three valence electrons; lose three electrons; charge of metal ions is +3; no nonmetals in this group; none.
For example, boron is an element with atomic number 5, which means it has 5 protons and 5 electrons, bcause atom has neutral charge.
Electron configuration of boron: ₅B: 1s² 2s² 2p¹, it has three valence electrons in 2s and 2p orbitals.
Atomic number is the number of protons, which is characteristic of a chemical element.
4) Carbon group - p block; four valence electrons; lose two or four electrons; charge of metal ions is +2 or +4; nonmetals gain four electrons; charge of nonmetals is -4.
Carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb) and flerovium (Fl) are in group 14 of Periodic table. They have same number of valence electrons (four) and similar chemical properties.
For example, carbon is a chemical element with symbol C and atomic number 6, which means it has 6 protons and six electrons. Valence electrons are in 2s and 2p orbitals.
Electron configuration of carbon atom: ₆C 1s² 2s² 2p².
5) Nitrogen group - p block; five valence electrons; lose three or five electrons; charge of metal ions is +3 or +5; nonmetals gain three electrons; charge of nonmetals is -3.
Nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi) and moscovium (Mc) are in group 15 of Periodic table. They have same number of valence electrons (five).
For example, bizmuth (Bi) has atomic number 83, it has 83 protons and 83 electrons. Valence electrons are in 6s and 6p orbitals.
Electron configuration of bizmuth atom: ₈₃Bi [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³.
6) Oxygen group - p block; six valence electrons; lose four or six electrons; charge of metal ions is +4 or +6; nonmetals gain two electrons; charge of nonmetals is -2.
Oxygen (O), sulfur (S), selenium (Se), tellurium (Te) and the radioactive element polonium (Po) are in group 16 of Periodic table. They have same number of valence electrons (six).
For example, electron configuration of oxygen atom: ₈O 1s² 2s² 2p⁴.
Oxygen atom has six valence electrons (2s² 2p⁴), so it is in 16 group of Periodic table of elements.
7) Halogens - p block; seven valence electrons; nonmetals gain one electron; charge of nonmetals is -1.
Halogen elements are in group 17: fluorine (F), chlorine (Cl), bromine (Br) and iodine (I). They are very reactive and easily form many compounds.
Halogens need to gain one electron to have electron cofiguration like next to it noble gas.
For example, fluorine has 9 electrons and it gain easily one electron in chemical reaction to have electron configuration like noble gas neon (Ne) with 10 electrons.
Electron configuration of fluorine: ₉F 1s² 2s² 2p⁵.
8) Noble gases - p block; eight valence electrons (except helium with two valence electrons); do not gain or lose electrons; none.
Noble gases (group 18) are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.
Noble gases have very stable electron configuration and does not need to gain electrons, only when they gain energy .
Helium has atomic number 2, it has 2 protons and 2 electrons.
Electron configuration of helium atom: ₂He 1s².
Electron configuration of krypton atom:
₃₆Kr 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶.
When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. HCl (aq) + KOH (aq) H2O (l) + KCl (aq) The reaction gives off heat energy, so it is an reaction.
A reaction that gives off heat energy is called Exothermic. (Answer).
A reaction that absorbs heat from the surroundings is called endothermic.
Answer: Exothermic
Explanation:
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be negative.
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be positive.
[tex]HCl(aq)+NaOH(aq)\rightarrow KCl(aq)+H_2O(aq)[/tex] is an example of neutralization as acid and base combines to form salt and water and exothermic reaction as it releases heat in the reaction.
What does graphite contain that is similar to metals
Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 33.4 g of Fe reacts completely with oxygen?
Molar Mass information: Iron = 55.8 g/mol, Oxygen= 15.9 g/mol
The grams of Fe₂O₃ that are formed is 47.68 g
calculation
Step 1: write the equation for reaction
4 Fe +3O₂ → 2 Fe₂O₃
Step 2: find the moles of Fe
moles = mass÷ molar mass
= 33.4 g÷55.8 g/mol =0.5986 moles
Step 3 : use the mole ratio to determine the moles of Fe₂O₃
That is from equation above Fe:Fe₂O₃ is 4:2 therefore the moles of Fe₂O₃ is = 0.5986 moles x 2/4 =0.2993 moles
Step 4 : find the mass of Fe₂O₃
mass = mass x molar mass
The molar mass of Fe₂O₃ = (55.8 x 2 +(15.9 x3) = 159.3 g/mol
mass is therefore = 0.2993 moles x 159.3 g/mol =47.68 g
Answer:
47.8 g
Explanation:
Using the law of conservation of energy, explain why an LED light is more energy efficient that an incandescent light bulb.
Answer:
An LED light uses one-third the energy of an incandescent bulb to produce the same amount of light.
Step-by-step explanation:
A typical 100 W incandescent bulb produces about 5 % visible light, 83 % IR radiation, and 12 % heat (it is the IR radiation that makes the bulb feel hot).
It produces about 5 J of light energy for every 100 J of energy input.
A typical LED bulb produces about 15 % visible light and 85 % heat (LEDs feel cool, because they don't produce IR radiation).
It produces about 15 J of light energy for every 100 J of energy input.
Thus, an LED light is about three times as efficient at converting electrical energy into light
Final answer:
An LED light is more energy efficient than an incandescent bulb as it converts more electrical energy into light with less waste as heat, making it a cost-effective and environmentally friendly option.
Explanation:
Using the law of conservation of energy, an LED light is more energy efficient than an incandescent light bulb because it converts a higher percentage of electrical energy into light, with minimal energy wasted as heat. Incandescent bulbs, in contrast, waste much of their energy as heat. For example, a 60-W incandescent bulb can be replaced by a 15-W CFL (Compact Fluorescent Light), which has the same brightness and color, demonstrating CFL's higher efficiency. LED lights push this efficiency even further, being twice as efficient as CFLs and lasting five times longer, though initially more costly. The movement towards LED lighting is driven by their ability to reduce power consumption significantly, thus lowering the cost and environmental impact of lighting homes and businesses.