Answer:
Brainly or Chegg tutors.
Explanation:
Try those!
the amount of gram - atoms in two gramm of sulfur is (NB: S=32amu)
Answer:
3.76375e+22
Explanation:
(2/32)×(6.022 × 10^23)
What is the freezing point of an aqueous suger (C12H22O11) solution that boils at 110C°?
Sucrose doesn't show appreciable dissociation in water, so i≈1 in this case. by extension, −7.3°C is the approximate freezing point of this solution.
What is the freezing point?The temperature at which a liquid solidifies.
Sucrose doesn't show appreciable dissociation in water, so i≈1 in this case. by extension, −7.3°C is the approximate freezing point of this solution.
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An atom of elements x has one more shell of electrons than an atom of beryllium,but h are s one less valence electron then beryllium.which element is element X?
Element X is sodium.
If there is one more shell of electrons, then this means it is one period below.
Since there is one less valence electron, it is one group to the left.
describe the trends in the atomic size, location energy and electrongavity from left to right across a period in periodic table
Atomic size decreases in a period but the ionization energy and electronegativity increases across a period.
Describe the trends in the atomic size, ionization energy and electronegativity?Atomic radius decreases across a period because of nuclear charge increases whereas atomic radius of atoms generally increases from top to bottom within a group because there is again an increase in the positive nuclear charge.
Ionization energy increases when we move from left to right across an period and decreases from top to bottom.
Electronegativity also increases from left to right across a period and decreases from top to bottom.
So we can conclude that atomic size decreases in a period but the ionization energy and electronegativity increases across a period.
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Calculate the mass in grams of each of the following using dimensional analysis:
a. 6.02 x 1023 atoms of Mg
3.01 x 1023 formula units of CaCl2
12.4 x 1015 molecules of formaldehyde (CH2O)
The mass in grams of each of the following using dimensional analysis is:
6.02 x 10²³ atoms of Mg = 12g of Mg3.01 x 10²³ formula units of CaCl2 = 55.5g of CaCl212.4 x 10¹⁵ molecules of formaldehyde (CH2O) = 0.000000618g of formaldehydeHow to calculate mass?The mass of a substance can be calculated in different ways depending on whether molecules or moles are given.
First, we need to convert atoms/formula units/molecules to moles as follows:
6.02 × 10²³ ÷ 6.02 × 10²³ = 1 mole of Mg3.01 x 10²³ ÷ 6.02 × 10²³ = 0.5 moles of CaCl212.4 x 10¹⁵ ÷ 6.02 × 10²³ = 2.06 × 10-⁸ moles of formaldehydeNext, we convert each mole value to mass as follows:
1 mole of Mg = 1 × 12 = 12g of Mg0.5 moles of CaCl2 = 0.5 × 111 = 55.5g of CaCl22.06 × 10-⁸ moles of CH2O = 0.000000618g of formaldehydeLearn more about mass at: https://brainly.com/question/19694949
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How many moles of HCl are required to react with 1 g of zinc?
Answer:
Explanation:
To solve problems like this, the very first thing to do is to write out the balanced equation for the process. The reaction is
Zn(s) + HCl(aq) → ZnCl2(aq) + H2(g)
and the balanced equation is
Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g)
So, by examining the stoichiometry, you can see that for every mole of Zn, two moles of HCl will be required. In turn, we need to know the number of moles of Zn is represented by 10.4 g. The molecular weight of Zn is 65.38 g/mol so
moles of Zn = 10.4 g/65.38 g/mol = 0.159 moles
and, twice as many moles of HCl is required so
# of moles of HCl required = 2 * 0.159 = 0.318 moles
Given the chemical formulas of the following compounds, name each compound and state the rules you used to determine each name. KI, Fe2O3, (NH4)3PO4
Answer:
1.) KI
-------> potassium iodide
Potassium (K⁺) is a metal and iodine (I⁻) is a nonmetal. Therefore, when naming, there are no prefixes denoting how many of each element is in the compound. Because potassium is listed first in the compound, it must be the cation. Because iodine is listed second, it must be the anion. Anions in naming have their endings dropped and have the suffix -ide added.
2.) Fe₂O₃
-------> iron(III) oxide
Iron (Fe³⁺) is a metal and oxygen (O²⁻) is a nonmetal. Therefore, when naming, there are no prefixes denoting how many of each element is in the compound. Because iron is listed first, it is the cation and oxygen is the anion. Both of the elements have charges that do not balance each other (denoted by the subscripts). Because iron can have multiple different charges, the charge of iron (+3) should be listed when naming.
3.) (NH₄)₃PO₄
-------> ammonium phosphate
Ammonium (NH₄⁺) and phosphate (PO₄³⁻) are both polyatomic ions. When these ions bond, they also don't have quantity prefixes. Ammonium is the cation and phosphate is the anion. No roman numerals are necessary because the polyatomic ions always have a particular charge.
How is the Sun classified?
as a giant star
as a medium star
as a white dwarf
as a neutron star
Answer:
B.) As a medium star
Explanation:
A.) is incorrect. It is not a giant star because there a millions are stars which are much more massive.
B.) is correct. Our Sun has a radius of about 437,000 miles. Technically our Sun is classified as a G-type main-sequence star, aka. yellow dwarf star. The Sun is generally classified as this type of star.
C.) is incorrect. While the Sun's light is similar to the light of white dwarf, it is still most certainly classified as a yellow dwarf star.
D.) is incorrect. Neutrons stars are collapsed, incredibly dense stars. They are around the size of a city.
Answer:
b
Explanation:
took the test
If 381 mL of 9.96 M LiCl is diluted with water to make 750 mL of solution calculate the molarity of the new solution.
Answer:
5.06 M LiCl
Explanation:
To find the new molarity of the solution, you need to (1) find the amount of moles LiCl (via the molarity equation using the original molarity and volume) and then (2) calculate the new molarity (via the molarity equation using the new volume and old moles). The final answer should have 3 sig figs to match the given values.
Molarity (M) = moles / volume (L)
Step (1)
381 mL / 1,000 = 0.381 L
Molarity = moles / volume
9.96 M = moles / 0.381 L
(9.96 M) x (0.381 L) = moles
3.79 = moles
Step (2)
750 mL / 1,000 = 0.750 L
Molarity = moles / volume
Molarity = 3.79 moles / 0.750 L
Molarity = 5.06 M
For the following reaction, 41.0 grams of sulfuric acid are allowed to react with 36.5 grams of zinc hydroxide. What is the maximum amount of zinc sulfate that can be formed? Mass = g What is the FORMULA for the limiting reactant? What amount of the excess reactant remains after the reaction is complete? Mass = g
The FORMULA for the limiting reagent is [tex]ZnOH_2[/tex].
4.27 grams of reactant remains after the reaction is complete.
What is a limiting reagent?The limiting reagent is the reactant that is completely used up in a reaction and thus determines when the reaction stops.
Given data:
Mass of sulfuric acid = 41.0 grams
Molar mass of sulfuric acid = 98.08 g/mol
Mass of zinc hydroxide = 36.5 grams
Molar mass of zinc hydroxide = 99.424 g/mol
Step 1:moles sulfuric acid = mass sulfuric acid / molar mass sulfuric acid
moles sulfuric acid = 41.0 grams / 98.08 g/mol
moles sulfuric acid = 0.41 moles
Step 2: moles of zinc hydroxide
moles zinc hydroxide = 36.5 grams / 99.424 g/mol
moles zinc hydroxide =0.367 moles
Step 3: Calculate limiting reactant
zinc hydroxide is the limiting reactant. It will completely be consumed.
There will remain 0.41 moles - 0.367 moles = 0.043 moles
This is 0.043 moles x 99.424 g/mol
= 4.27 grams
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Identify the branch of chemistry being described.
a. _______________ study of the behavior and changes in matter including energy transfers, reaction mechanisms, and reaction rates.
b. _______________ study of compounds and chemicals containing carbon, which include pharmaceuticals, drugs, and plastics.
c. _______________ study of the components and composition of matter, including food nutrients, and quality control.
d. _______________ study of matter and processes that occur in biological organisms, including metabolism and fermentation.
Answer:
a. Physical Chemistry
b.Organic Chemistry
c.Food analysis, a very important branch of analytical chemistry
d. Biochemistry
Explanation:
Which of the following is an example of a metamorphic rock?
Granite
Limestone
Marble
Pumice
Answer:
C
Explanation:
Marble is the correct answer
Identify if phosphorous is paramagnetic or diamagnetic and explain why.
Due to the presence of three unpaired electrons, phosphorus is paramagnetic.
Electronic configuration of Phosphorus:-
[Ne] 3S2 3P3
What determines if an element is paramagnetic or diamagnetic?
By looking at a substance's electron configuration, one can identify whether or not it has magnetic qualities. If a substance has unpaired electrons, it is paramagnetic; if all of its electrons are paired, it is diamagnetic.
Paramagnetic:-A tiny, positive susceptibility to magnetic fields exists in materials. When exposed to a magnetic field, these materials are only weakly drawn to it; once the external field is removed, they lose their magnetic qualities.
Diamagnetic:-A weak, negative sensitivity to magnetic fields exists in materials. When exposed to a magnetic field, diamagnetic materials are partially repulsed and lose their magnetic properties when the external field is removed.
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2. Grapes, when tested with Benedict's reagent, gave brick red colour, whereas the iodine test didn't show any colour change.
A. What does the test results indicate about grapes?
B. Rice contains complex carbohydrates. If grapes are substituted with rice, what would be the test result?
Rice would not show any negative test with Benedicts solution but will show blue black color with iodine.
What is the Benedicts solution?The Benedicts solution is used to test for the presence of reducing sugars in a solution. The brick red color is a positive test for reducing sugars such as glucose.
Owing to the fact that grape does not have starch, it shows a negative test for starch. Rice would not show any negative test with Benedicts solution but will show blue black color with iodine.
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7. What produces more severe burns, boiling water or steam?
Answer:
boiling water
Explanation:
boiling water produces more severe burns
How many moles are in 15000 atoms of iron (Fe)?
Avogadro's law states that in each mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] particles.
This means that 15000 atoms is equal to [tex]\frac{15000}{6.022 \times 10^{23}}=\boxed{2.4909 \times 10^{-20} \text{ moles (to 5 sf)}}[/tex]
There are 2.49 × [tex]10^{-20}[/tex] moles present in 15000 atoms of iron (Fe).
What is a mole?A mole is the quantity of a material that includes 6.023 x [tex]10^{23}[/tex] of that substance's components.
What is an atom?The smallest component of ordinary stuff that makes up a chemical element would be an atom.
Calculation of mole
It is known that 1 mole = 6.023 x [tex]10^{23}[/tex] particles.
So, the 1500 atoms will be equal to the = 1500 / 6.023 x [tex]10^{23}[/tex] = 2.49 × [tex]10^{-20}[/tex] moles .
Therefore, there are 2.49 × [tex]10^{-20}[/tex] moles present in 15000 atoms of iron (Fe).
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A 2.49 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/°C. If the temperature rose from 29.5°C to 69.8°C, determine the value of ΔH°comb for aniline.
The value of delta H° for aniline = 6415 Kj/mol
calculation
Step 1: find heat
Q (heat) = C (specific heat capacity) x ΔT (change in temperature)
C= 4.25 kj/c°
ΔT = 69.8-29.5 = 40.3 c°
Q= 4.25 kj/c x 40.3 c = 171.28 kj
Step 2: find the moles of aniline
moles = mass/molar mass
= 2.49 g/ 93.13 g/mol =0.0267 moles
Step 3: find delta H
171.28 kj/0.0267 mol = 6415 kj/mol
since the reaction is exothermic delta H = 6415 Kj/mol
Answer:
-6.41x10^3
Explanation:
2.49 is 3 significant figures, so your answer should reflect that. Since heat is lost to the surroundings, the reaction is exothermic, and the answer should be negative.
▸ Exam Instructions
Question 15 of 20:
Select the best answer for the question.
15. Why can over-the-counter medications be sold to consumers without the need for a prescription?
A. They're found to give benefits to all people, regardless of whether a patient is ill or not.
B. They're all covered by insurance companies and therefore a prescription isn't necessary.
C. They're safe to use without the regulation of a physician, according to a regulatory agency.
D. They're considered the most important and consumers are encouraged to keep stock of certain types at home.
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What’s the gravitational potential energy of a book 2.0 meters above the floor with a mass of 1.5 kilograms
Answer:
29.3 joules
Explanation:
P.E. = mgh
= 1.5 kg * 9.81 m/s^2 * 2 m = 29.3 Joules
5. In an oxyacetylene welding torch, acetylene (C2H2) burns in pure oxygen with a very hot flame. The reaction is: 2 C2H2 + 5 O2 → 4 CO2 + 2 H2O.
a. What is the mass of C2H2 that is consumed if 35.0 grams of oxygen is allowed to react?
b. How many milliliters of water will be produced when the 35.0 grams of oxygen from part a. above is allowed to react. The density of water is 1.0 gram
Answer:
[tex]a. \ \ \ \text{The mass of ethylene is 11.375 g}. \\ \\ b. \ \ \ \text{The volume of water produced is 7.875 ml}.[/tex]
Explanation:
a. According to the chemical equation for the combustion of ethylene, 5
moles of oxygen are required to react with 2 moles of ethylene, hence
[tex]m_{C_{2}H_{2}} \ = \ 35 \ \text{g} \ \times \ \displaystyle\frac{1 \ \text{mol}}{\left(2 \times 16 \right) \text{g}} \ \times \ \displaystyle\frac{2 \ \text{mol}}{5 \ \text{mol}} \ \times \ \displaystyle\frac{\left(12 \ \times \ 2 \ + \ 1 \ \times \ 2 \right) \ \text{g}}{1 \ \text{mol}} \\ \\ m_{C_{2}H_{2}} \ = \ 11.375 \ \text{g}[/tex]
b. Similarly, 5 moles of oxygen are required as a reactant to produce 2
moles of water, thus
[tex]m_{H_{2}O} \ = \ 35 \ \text{g} \ \times \ \displaystyle\frac{1 \ \text{mol}}{\left(2 \times 16 \right) \text{g}} \ \times \ \displaystyle\frac{2 \ \text{mol}}{5 \ \text{mol}} \ \times \ \displaystyle\frac{\left(1 \ \times \ 2 \ + \ 16 \right) \ \text{g}}{1 \ \text{mol}} \\ \\ m_{H_{2}O} \ = \ 7.875 \ \text{g}[/tex]
Given that the density of water is [tex]1.0 \ \text{g ml}^{-1}[/tex], therefore
[tex]\rho_{H_{2}O} \ = \ \displaystyle\frac{m_{H_{2}O}}{V_{H_{2}O}} \\ \\ V_{H_{2}O} \ = \ \displaystyle\frac{m_{H_{2}O}}{\rho_{H_{2}O}} \\ \\ V_{H_{2}O} \ = \ \displaystyle\frac{7.875 \ \text{g}}{1.0 \ \text{g ml}^{-1}} \\ \\ V_{H_{2}O} \ = \ 7.875 \ \text{ml}[/tex]
11.375 g ethylene is consumed if 35.0 grams of oxygen is allowed to react and 7.875 ml of water will be produced when the 35.0 grams of oxygen is allowed to react.
What are moles?A mole is defined as 6.02214076 ×[tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
According to the chemical equation for the combustion of ethylene, 5
moles of oxygen are required to react with 2 moles of ethylene, hence
[tex]m_{_C_2_H_2}[/tex] [tex]= 35gX \frac{1 mol}{(2 \;X\; 16)g } X \frac{2 mol}{(5\;mol )} X \frac{26g}{1 mol }[/tex]
[tex]m_{_C_2_H_2} = 11.375 g[/tex]
Similarly, 5 moles of oxygen are required as a reactant to produce 2 moles of water, thus
[tex]m_{_H_2_O} = 35gX \frac{1 mol}{(2 \;X\; 16)g } X \frac{2 mol}{(5\;mol )} X \frac{18g}{1 mol }[/tex]
[tex]m_{_H_2_O} = 7.875 g[/tex]
Given that the density of water is [tex]1.0g ml^{-1}[/tex], therefore
[tex]Density = \frac{Mass \;of \;water}{Volume \;of \;water}[/tex]
[tex]Volume \;of \;water = \frac{7.875}{1.0 g ml^{-1}}[/tex]
The volume of water = 7.875 ml
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How many grams of Fe(NO3)3 are present in a 20.0 mL sample of a 0.500 M solution?
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.80g of Fe(NO[tex]_3[/tex])[tex]_3[/tex] are present in a 20.0 mL sample of a 0.500 M solution.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute/volume of solution in litre (1)
Where,
moles= given weight /by molecular weight
= w/241.8
Substituting values in equation 1
0.500= (w/241.8)/(20.0 /1000)
w=0.80g
Therefore, 0.80g of Fe(NO[tex]_3[/tex])[tex]_3[/tex] are present in a 20.0 mL sample of a 0.500 M solution.
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Which buffer can be suitable to prepare a solution that needs to be buffered at pH 4? Explain your
choice.
A. Formic acid/Formiate buffer
B. Carbonic acid/Bicarbonate buffer
C. Ammonia/Ammonium buffer
D. Any buffer will work.
E. None of the buffers will be suitable.
34 Which of the following will form a buffer when mixed together? Explain
.
Which buffer can be suitable to prepare a solution that needs to be buffered at pH 4? Explain your
choice.
A. Formic acid/Formiate buffer
B. Carbonic acid/Bicarbonate buffer
C. Ammonia/Ammonium buffer
D. Any buffer will work.
E. None of the buffers will be suitable.
34 Which of the following will form a buffer when mixed together? Explain a weak acid/base and its conjugate base/acid in the form of salt
Cyclopropane is a compound of carbon and hydrogen that is used as a general anaesthetic. When 1 g of this substance was burned completely in oxygen, 3.14 g of carbon dioxide and 1.29 g of water were produced. What is the empirical formula of the compound? The molar mass of cyclopropane is about 42 g/mol. What is the molecular formula?
Arrange the following elements in order of decreasing atomic radius: Ba , Sn , Cl , Pb , Se .
Rank elements from largest to smallest.
Answer:
Ba, Pb, Sn, Se, Cl
Explanation:
The atomic radius increases when going right to left and top to bottom on the periodic table and decreases going the opposite way so I put it in order based on that.
describe what happens when two substances at different tempatures come into contact. describe how the law of conservation of energy applies to this system
If two objects at different temperatures are brought in contact with each other, energy is transferred from the hotter object to the colder object.
What is the law of conservation of energy?The total energy of an isolated system remains constant irrespective of whatever internal changes may take place with energy conevrting in one form and reappearing in another.
When two substances at different temperatures come into contact, the substance with a higher temperature will transfer heat energy to the substance with a lower temperature, until their temperatures get equal.
Here, if the two substances are isolated then the law of conservation of energy states that the when heat released by the substance with a higher temperature is the same amount of heat gained by the substance lower a lower temperature.
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Select the correct answer.
Which type of crude oil is considered to be the highest quality for gasoline?
O Brent Blend
O West Texas Intermediate
O OPEC Blend
O All crude oil
The type of crude oil that is considered to be the highest quality for gasoline is West Texas Intermediate (Option B).
What is oil?Oil is a fossil fuel obtained from Earth's crust, which is fundamental nowadays to generate electricity.
West Texas Intermediate is a highly pure and high-type energy source of crude oil used in industry.
In conclusion, the type of crude oil that is considered to be the highest quality for gasoline is West Texas Intermediate.
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Type of chemical reaction of Ca(OH)2.
Answer:
Combination reaction
This reaction is a combination reaction because calcium oxide and water combine to create calcium hydroxide as the only result.
What is Ca(OH)2?An inorganic substance called calcium hydroxide has several uses. It is also known as slaked lime, and limewater is the name of its aqueous solution.
Calcium hydroxide has the chemical formula Ca in both its composition and structure (OH)
2
and it has a 74.09 g/mol molar mass.
The calcium metal cation is linked to two hydroxide anions in this ionic molecule. Calcium hydroxide has a polymeric structure in its solid state, which is made possible by hydrogen bonds between the layers.
The mineral portlandite, a naturally occurring but seldom type of calcium hydroxide, is present in various volcanic and metamorphic rocks.
In order to make calcium hydroxide for use in industry, calcium oxide (lime or quicklime) is reacted with water.
CaO + H
2
O → Ca(OH)
2
On lesser scales, it may also be produced through the reaction of aqueous calcium chloride and sodium hydroxide.
Physical characteristics: It has a melting point of 580 °C and can be found as white powder or colorless crystals with a density of 2.21 g/cm3.
Chemical characteristics: Water may rather easily dissolve calcium hydroxide. It partly dissolves in water to create limewater, a moderately basic solution. Ca(OH)2 solution or limewater
salts when combined with acids, and it can corrode various metals, including aluminum. The process of carbonatation, which produces calcium carbonate from limewater and carbon dioxide, is advantageous:
Ca(OH)2+ CO2→ CaCO3+ H2O
Uses: Calcium hydroxide is used in a wide range of industrial processes, including the production of Kraft paper, water and sewage treatment, the production of ammonia, and pH adjustment. Additionally, it is a crucial component of mortars, cement, and plaster. It may be used in the food business for a variety of purposes, including pH correction, calcium fortification, digestion help, and baking soda replacement because it is a relatively non-toxic and gentle base.
Calcium hydroxide is not poisonous at low doses and poses no safety risks. However, inhaling, eating, or coming into touch with the aqueous calcium hydroxide solution at greater concentrations might result in lung damage, chemical burns, blindness, or serious skin irritation.
5 grams of sodium chloride is dissolved to make 0.5 L of solution
The concentration of the solution is 0.17M
The missing question is
What is the concentration of the solution ?
What is Molarity ?Molarity is the moles of solute in 1 liter of solution.
It is the measure of concentration of a solution in mol/l .
It is given that
5 grams of sodium chloride is dissolved to make 0.5 L of solution
the concentration of the solution
Molecular weight of Sodium Chloride = 58.44 g
58.44 g of NaCl = 1 mol
5g of NaCl = 5/58.44 = 0.086 moles
Molarity = 0.086 / 0.5
Molarity = 0.17 M
The concentration of the solution is 0.17M
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1. 50.0 g of an unknown metal was heated to 95.0 °C and added to 45.0 g of water at 25.0 °C
in a calorimeter. Once the system reached equilibrium the final temperature was 28.5 °C.
Calculate the specific heat capacity of the metal with correct units.
2. 60.0 g of nickel heated to 100.0 °C was added to 55.0 g of water at 25.0 °C inside a
calorimeter and the system was allowed to reach equilibrium. What would be the final
temperature of the metal and water? (specific heat of Ni = 0.44 J/g °C)
.
3. One challenge during calorimetry is to minimize the heat lost to the environment during
the experiment. Suggest how you would minimize the heat loss during the experiment (read
the steps of the experiment before you answer the question)
Answer
Q = mcΔT
Qwater = -Qmetal
(100 g)(4.18 J/g°C)(25°C - 20°C) = -(50 g)c(25°C - 90.0°C)
2090 J = (3250 g °C)c
c = 0.643 J/g °C
Consider this reaction, which occurs in the atmosphere and contributes to photochemical smog:
2Fe(s) + 3Cl2(g) →2FeCl3(s)
If there is 15.52 g Fe and excess Cl2 present, the reaction yields 34.5 g FeCl3. Calculate the
percent yield for the reaction.
%
2Fe(s) + 3Cl₂(g) →2FeCl₃(s)
mol Fe = 15.52 : 56 g/mol = 0.277
mol FeCl₃ = mol Fe = 0.277 (same coefficient)
mass FeCl₃ = 0.277 x 162.2 g/mol = 44.93 g
% yield = 34.5 : 44.93 = 76.79 %
