Chemistry Steps

## General Chemistry

Stoichiometry.

This is a comprehensive, end-of-chapter set of practice problems on stoichiometry that covers balancing chemical equations, mole-ratio calculations, limiting reactants, and percent yield concepts.

The links to the corresponding topics are given below.

• The Mole and Molar Mass
• Molar Calculations
• Percent Composition and Empirical Formula
• Stoichiometry of Chemical Reactions

Limiting Reactant

• Reaction/Percent Yield
• Stoichiometry Practice Problems

Balance the following chemical equations:

a) HCl + O 2 → H 2 O + Cl 2

b) Al(NO 3 ) 3 + NaOH → Al(OH) 3 + NaNO 3

c) H 2 + N 2 → NH 3

d) PCl 5 + H 2 O → H 3 PO 4 + HCl

e) Fe + H 2 SO 4 → Fe 2 (SO 4 ) 3 + H 2

f) CaCl 2 + HNO 3 → Ca(NO 3 ) 2 + HCl

g) KO 2 + H 2 O → KOH + O 2 + H 2 O 2

h) Al + H 2 O → Al 2 O 3 + H 2

i) Fe + Br 2 → FeBr 3

j) Cu + HNO 3 → Cu(NO 3 ) 2 + NO 2 + H 2 O

k) Al(OH) 3 → Al 2 O 3 + H 2 O

l) NH 3 + O 2 → NO + H 2 O

m) Ca(AlO 2 ) 2 + HCl → AlCl 3 + CaCl 2 + H 2 O

n) C 5 H 12 + O 2 → CO 2 + H 2 O

o) P 4 O 10 + H 2 O → H 3 PO 4

p) Na 2 CrO 4 + Pb(NO 3 ) 2 → PbCrO 4 + NaNO 3

q) MgCl 2 + AgNO 3 → AgCl + Mg(NO 3 ) 2

r) KClO 3 → KClO 4 + KCl

s) Ca(OH) 2 + H 3 PO 4 → Ca 3 (PO 4 ) 2 + H 2 O

Consider the balanced equation:

C 5 H 12 + 8 O 2 → 5CO 2 + 6H 2 O

Complete the table showing the appropriate number of moles of reactants and products.

How many grams of CO 2  and H 2 O are produced from the combustion of 220. g of propane (C 3 H 8 )?

C 3 H 8 (g) + 5O 2 (g) → 3CO 2 (g) + 4H 2 O(g)

How many grams of CaCl 2 can be produced from 65.0 g of Ca(OH) 2 according to the following reaction,

Ca(OH) 2 + 2HCl → CaCl 2 + 2H 2 O

How many moles of oxygen are formed when 75.0 g of Cu(NO 3 ) 2 decomposes according to the following reaction?

2Cu(NO 3 ) 2   → 2CuO + 4NO 2  + O 2

How many grams of MnCl 2  can be prepared from 52.1 grams of MnO 2 ?

MnO 2  + 4HCl → MnCl 2  + Cl 2  + 2H 2 O

Determine the mass of oxygen that is formed when an 18.3-g sample of potassium chlorate is decomposed according to the following equation:

2KClO 3 (s) → 2KCl(s) + 3O 2 (g).

How many grams of H 2 O will be formed when 48.0 grams H 2 are mixed with excess hydrogen gas?

2H 2  + O 2 → 2H 2 O

Consider the chlorination reaction of methane (CH4):

CH 4 (g) + 4Cl 2 (g) → CCl 4 (g) + 4HCl(g)

How many moles of CH 4 were used in the reaction if 51.9 g of CCl4 were obtained?

How many grams of Ba(NO 3 ) 2 can be produced by reacting 16.5 g of HNO 3 with an excess of Ba(OH) 2 ?

Ethanol can be obtained by fermentation – a complex chemical process breaking down glucose to ethanol and carbon dioxide.

C 6 H 12 O 6    →    2C 2 H 5 OH   +    2CO 2                                                       glucose                   ethanol

How many mL of ethanol (d =0.789 g/mL) can be obtained by this process starting with 286 g of glucose?

36.0 g of butane (C 4 H 10 ) was burned in an excess of oxygen and the resulting carbon dioxide (CO 2 ) was collected in a sealed vessel.

2C 4 H 10 + 13O 2 → 8CO 2 + 10H 2 O

How many grams of LiOH will be necessary to consume all the CO 2 from the first reaction?

2LiOH + CO 2 → Li 2 CO 3 + H 2 O

13. Which statement about limiting reactant is correct?

a) The limiting reactant is the one in a smaller quantity.

b) The limiting reactant is the one in greater quantity.

c) The limiting reactant is the one producing less product.

d) The limiting reactant is the one producing more product.

Find the limiting reactant for each initial amount of reactants.

4NH 3 + 5O 2 → 4NO + 6H 2 O

a) 2 mol of NH 3 and 2 mol of O 2

b) 2 mol of NH 3 and 3 mol of O 2

c) 3 mol of NH 3 and 3 mol of O 2

d) 3 mol of NH 3 and 2 mol of O 2

Note:  This is not a multiple-choice question. Each row represents a separate question where you need to determine the limiting reactant.

How many g of hydrogen are left over in producing ammonia when 14.0 g of nitrogen is reacted with 8.0 g of hydrogen?

N 2 (g) + 3 H 2 (g) → 2 NH 3 (g)

How many grams of PCl 3 will be produced if 130.5 g Cl 2 is reacted with 56.4 g P 4 according to the following equation?

6Cl 2 (g) + P 4 (s) → 4PCl 3 (l)

How many grams of sulfur can be obtained if 12.6 g H 2 S is reacted with 14.6 g SO 2 according to the following equation?

2H 2 S(g) + SO 2 (g) → 3S(s) + 2H 2 O(g)

The following equation represents the combustion of octane, C 8 H 18 , a component of gasoline:

2C 8 H 18 (g) + 25O 2 (g) → 16CO 2 (g) + 18H 2 O(g)

Will 356 g of oxygen be enough for the complete combustion of 954 g of octane?

When 140.0 g of AgNO 3 was added to an aqueous solution of NaCl, 86.0 g of AgCl was collected as a white precipitate. Which salt was the limiting reactant in this reaction? How many grams of NaCl were present in the solution when AgNO 3 was added?

AgNO 3 (aq) + NaCl(aq) → AgCl(s) + NaNO 3 (aq)

Consider the reaction between MnO 2 and HCl:

MnO 2 + 4HCl → MnCl 2 + Cl 2 + 2H 2 O

What is the theoretical yield of MnCl 2 in grams when 165 g of MnO 2 is added to a solution containing 94.2 g of HCl?

Percent Yield

21. In a chemistry experiment, a student obtained 5.68 g of a product. What is the percent yield of the product if the theoretical yield was 7.12 g?

When 38.45 g CCl 4 is reacted with an excess of HF, 21.3 g CCl 2 F 2 is obtained. Calculate the theoretical and percent yields of this reaction.

CCl 4 + 2HF → CCl 2 F 2 + 2HCl

Iron(III) oxide reacts with carbon monoxide according to the equation:

Fe 2 O 3 ( s ) + 3CO( g ) → 2Fe( s ) + 3CO 2 ( g )

What is the percent yield of this reaction if 623 g of iron oxide produces 341 g of iron?

Determine the percent yield of the reaction if 77.0 g of CO 2  are formed from burning 2.00 moles of C 5 H 12  in 4.00 moles of O 2 .

C 5 H 12 + 8 O 2 → 5CO 2  + 6H 2 O

The percent yield for the following reaction was determined to be 84%:

N 2 ( g ) + 2H 2 ( g ) → N 2 H 4 ( l )

How many grams of hydrazine (N 2 H 4 ) can be produced when 38.36 g of nitrogen reacts with 6.68 g of hydrogen?

Silver metal can be prepared by reducing its nitrate, AgNO 3  with copper according to the following equation:

Cu( s ) + 2AgNO 3 ( aq ) → Cu(NO 3 ) 2 ( aq ) + 2Ag( s )

What is the percent yield of the reaction if 71.5 grams of Ag was obtained from 132.5 grams of AgNO 3  ?

Industrially, nitric acid is produced from ammonia by the Ostwald process in a series of reactions:

4NH 3 ( g ) + 5O 2 ( g ) → 4NO( g ) + 6H 2 O( l )

2NO( g ) + O 2 ( g ) → 2NO 2 ( g )

2NO 2 ( g ) + H 2 O( l ) → HNO 3 ( aq ) + HNO 2 ( aq )

Considering that each reaction has an 85% percent yield, how many grams of NH 3 must be used to produce 25.0 kg of HNO 3 by the above procedure?

Aspirin (acetylsalicylic acid) is widely used to treat pain, fever, and inflammation. It is produced from the reaction of salicylic acid with acetic anhydride. The chemical equation for aspirin synthesis is shown below:

In one container, 10.00 kg of salicylic acid is mixed with 10.00 kg of acetic anhydride.

a)  Which reactant is limiting? Which is in excess? b)  What mass of excess reactant is left over? c)  What mass of aspirin is formed assuming 100% yield (Theoretical yield)? d)  What mass of aspirin is formed if the reaction yield is 70.0% ? e)  If the actual yield of aspirin is 11.2 kg, what is the percent yield? f)  How many kg of salicylic acid is needed to produce 20.0 kg of aspirin if the reaction yield is 85.0% ?

## 3 thoughts on “Stoichiometry Practice Problems”

You forgot the subscript 3 for O in the molecular formula for acetic anhydride and the reaction is not balanced as written. For part F) it’s 18.1 kg and not1.81 kg as written in the final line of the solution.

Thanks for letting me know! Fixed.

You’re welcome!

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## Chemistry: Stoichiometry of Reactions

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#### IMAGES

1. Stoichiometry Practice Worksheet w/ Answer Key 2 Versions by Sweet Science

2. Pogil Stoichiometry Answer Key Model 2

3. Answer Key to Stoichiometry Problem Set

4. 14 Stoichiometry Worksheet 2 Answer Key / worksheeto.com

5. Practice

6. Stoichiometry Worksheet Answer Key Fresh Stoichiometry Worksheet 2

1. PDF Stoichiometry: Problem Sheet 2

Directions: Solve each of the following problems. Show your work, including proper units, to earn full credit. ___ CaCl2 + ___ AgNO3 ___ Ca(NO3)2 + ___ AgCl How many grams of silver chloride are produced when 45 g of calcium chloride react with excess silver nitrate? mol CaCl 2 mol AgCl 143 . 5 g AgCl g AgCl 45 g CaCl 2

2. 5.2.1: Practice Problems- Reaction Stoichiometry

PROBLEM \ (\PageIndex {1}\) Write the balanced equation and determine the information requested. Don't worry about state symbols in these reactions. The number of moles and the mass (in grams) of chlorine, Cl, required to react with 10.0 g of sodium metal, Na, to produce sodium chloride, NaCl. The number of moles and the mass (in milligrams) of ...

3. PDF Stoichiometry: Problem Sheet 1

Answers: 1A. 30 mol Ag 1B. 30 mol AgNO3 1C. 20 mol H2O 1D. 10 mol NO 2A. 38 mol N2H4 2B. 19 mol N2O4 2C. 76 mol H2O 3. 191 g Al2O3 B. How many moles of aluminum oxide are made if 3580 g of manganomanganic oxide are consumed? C.

4. Stoichiometry (article)

Multiplying the number of moles of H A 2 SO A 4 by this factor gives us the number of moles of NaOH needed: 3.16 × 10 − 2 mol H 2 SO 4 × 2 mol NaOH 1 mol H 2 SO 4 = 6.32 × 10 − 2 mol NaOH. Notice how we wrote the mole ratio so that the moles of H A 2 SO A 4 cancel out, resulting in moles of NaOH as the final units.

5. Chemistry Chapter 9 Stoichiometry

Chapter 9 Complete Stoichiometry Review Practice Problems with Answer Key.doc. Owner hidden. Dec 20, 2011. 57 KB. ... Chapter 9 Stoichiometry-2 Test Review Practice Problems with Answer Key.doc. Owner hidden. Dec 20, 2011. 36 KB. ... Chapter 9 Textbook Assignment 3.doc. Owner hidden. Dec 19, 2011. 22 KB.

6. PDF Stoichiometry Review Assignment Answer Key

Stoichiometry Review Assignment Answer Key Stoichiometry Review Assignment Answer Key Example 1: Calculate the mass of a magnesium, Mg, atoms in grams. 24.035 g Mg . 1 mol Mg . 1 molecule Mg = 4.04 x 10-23 g/Mg atom 1 mol Mg 6.02 x 1023 molecules 1 atom Mg

7. PDF Stoichiometry Worksheet 2 Answer Key

2 O 3 is used, how many kilograms of iron can be produced? The reaction is: Fe 2 O 3 + 3 C ---> 2 Fe + 3 CO 9. The average human requires 120.0 grams of glucose (C 6 H 12 O 6) per day. How many grams of CO 2 (in the photosynthesis reaction) are required for this amount of glucose? The photosynthetic reaction is: 6 CO 2 + 6 H 2 O ---> C 6 H 12 O ...

8. Stoichiometry (Worksheet)

Q4. Given the following reaction: H2SO4 + Na2CO3 → Na2SO4 +H2O + CO2 H 2 S O 4 + N a 2 C O 3 → N a 2 S O 4 + H 2 O + C O 2. Calculate the molarity of the H2SO4 H 2 S O 4 solution if it takes 40.0 mL of H2SO4 H 2 S O 4 to neutralize 46.7 mL of a 0.364 M Na2CO3 N a 2 C O 3 solution.

9. 13.8: Solution Stoichiometry

As we learned previously, double replacement reactions involve the reaction between ionic compounds in solution and, in the course of the reaction, the ions in the two reacting compounds are "switched" (they replace each other). Because these reactions occur in aqueous solution, we can use the concept of molarity to directly calculate the number of moles of reactants or products that will ...

10. Chemistry 11

Book 2: Stoichiometry . FULL NOTES BOOK KEY; ... Stoichiometric Calculations & Titrations Assignment # 2 KEY; Limiting & Excess Reagents Assignment # 3 KEY; Percent Yield & Percent Purity; Assignment # 4 KEY; Stoichiometry Review KEY; Labs: Acid Base Titration; ... Answer Key - unit_test_review_booklet_key.pdf; Unit 7: Chemical Bonding. Student ...

11. Stoichiometry Flashcards

Learn Test Match Q-Chat Created by arnasharma It is better to practice for this unit than memorizing. Still needs to be finished. Only completed 1/8 Terms in this set (25) Stoichiometry the branch of chemistry that deals with the relationship between the relative quantities of substances taking part in a chemical reaction

12. PDF Stoichiometry homework problems key

1. The reaction of calcium hydride with water can be used to prepare small quantities of hydrogen gas, as is done to fill weather-observation balloons. CaH2(s) + H2O(I) →Ca(OH)2(s) + H2(g) (not balanced) (a) How many grams of water are consumed in the reaction of 56.2 g CaH2? CaH2(s) + 2H2O(I) →Ca(OH)2(s) + 2H2(g) 56.2g CaH2 x 1 mol CaH2

13. Stoichiometry questions (practice)

Stoichiometry questions. Google Classroom. One type of anaerobic respiration converts glucose ( C 6 H 12 O 6 ) to ethanol ( C 2 H 5 O H ) and carbon dioxide. If the molecular weight of glucose is 180 grams/mol and the molar mass of ethanol is 46 g/mol, how many grams of carbon dioxide are produced when 1 mol of glucose is digested via respiration?

14. PDF Chapter 3 Stoichiometry

Stoichiometry Limiting reagent, example: Soda fizz comes from sodium bicarbonate and citric acid (H 3C 6H 5O 7) reacting to make carbon dioxide, sodium citrate (Na

15. Stoichiometry Practice Problems

a) answer This content is available to registered users only. Click here to Register! By joining Chemistry Steps, you will gain instant access to the answers and solutions for all the Practice Problems and the powerful set of General Chemistry 1 and 2 Summary Study Guides.

16. Stoichiometry Problem Sets

If you are a Task Tracker student, open the assignment using the link on the Task Tracker assignment board. Problem Set ST1: Introduction to Stoichiometry ... Problem Set ST7: Mass-to-Mass Stoichiometry 2. To use molar mass values and a balanced chemical equation to relate the mass of reactants to the mass of products. Includes 5 problems.

Stoichiometry Assignment Answers. 1. State the mole ratio between the reactants in the following balanced equation: 2. State the mole ratio between hydrogen chloride and water in reaction of barium. hydroxide with hydrogen chloride. 3. State the mole ratio between the reactants in the complete combustion of. .

18. 12.3: Mass-Mole Stoichiometry

While the mole ratio is ever-present in all stoichiometry calculations, amounts of substances in the laboratory are most often measured by mass. ... {mol} \: \ce{O_2}\) is produced with a mass of $$221 \: \text{g}$$. The answer has three significant figures because the given number of moles has three significant figures. Summary. Calculations ...

19. PDF Stoichiometry Calculation Practice Worksheet

Stoichiometry Calculation Practice Worksheet 1. Calculate the number of moles of NaOH that are needed to react with 500.0 g of H 2 SO 4 according to the following equation: H 2 SO 4 + 2 NaOH Na 2 SO 4 + 2 H 2 O ANS: 10.19 mol 2. Calculate the mass of NH 3 that can be produced from the reaction of 125 g of NCl 3 according to the following equation:

GENERAL CHEMISTRY-Fall 2020- ASSIGNMENT #2. 8p Q1. Nitrogen gas, N2, can be prepared by passing gaseous ammonia over solid copper (II) oxide, CuO, at high temperatures. The other products of the reaction are solid copper, Cu, and water. vapor. In a certain experiment, a reaction mixture containing 17.4 g NH3 and 86.8 g CuO yields.

21. Stoichiometry Virtual Lab-1

A. Calculate the formula mass of carbon monoxide (CO) by adding the. atomic mass of carbon and the atomic mass of oxygen: B. Calculate the formula mass of carbon dioxide (CO 2 ): Chemistry assignment name: date: student exploration: stoichiometry vocabulary: number, balanced equation, cancel, coefficient, conversion factor, dimensional.

22. Gizmo Stoichiometry Assignment

A. What volume of carbon dioxide (CO 2 ) will be produced if 2 moles of iron (Fe) is produced? [Note: In the Gizmo, it is assumed that all gases are at standard tempera- ture and pressure, or STP.] Given unit: moles_ Answer unit: _moles Solution: __moles. B.

23. PDF Stoichiometry Review Assignment Answer Key

Stoichiometry Review Assignment Answer Key Example 1: Calculate the mass of a magnesium, Mg, atoms in grams. 24.035 g Mg . 1 mol Mg . 1 molecule Mg = 4.04 x 10-23 g/Mg atom 1 mol Mg 6.02 x 1023 molecules 1 atom Mg Example 2: Calculate the number of atoms in one-millionth of a gram of magnesium, Mg.