Free Printable AP Chem Stoichiometry Practice

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AP Chem Stoichiometry Practice

Total questions: 20

Worksheet time: 1hrs 11mins

Name

Class

Date

Which set of coefficients correctly balances the equation below?

(a) C₄H₁₂ + (b) O₂ ⟶ (c) CO₂ + (d) H₂O

Choose from the below words

What are the products for this combustion reaction:

C₂H₄ + 2 O₂ ⟶ ?

C₂O₂

C₂H₄O₄

H₂O

CO₂

2 KClO₃ → 2 KCl + 3 O₂
When 6.70 moles of KClO₃ decompose completely according to the chemical equation above, (a) moles of oxygen are produced.

Choose from the below words

10.1

6.70 mol

1.00 mol

4.50 mol

2Na + 2H₂O → 2NaOH+ H₂

How many grams of hydrogen will be produced if 120 g of Na react completely?

5.2 g

2.6 g

690 g

45 g

SO₂+ PCl₅⟶ SOCl₂+ POCl₃

What mass of SOCl₂is produced when 16.2g SO₂react with 13.7g PCl₅?

7.87g

30.1g

26.4g

19.8g

When 10.0 moles of NH₃ react with 30.0 moles of NO, the limiting reactant is (a)

4NH₃+ 6NO ⟶ 5N₂ + 6H₂O

Choose from the below words

NH₃

N₂

H₂O

LiOH + KCl → LiCl + KOH

In the lab, a student reacted 20.0 g of lithium hydroxide with excess potassium chloride. The student collected 6.00 grams of lithium chloride. What is the percent yield?

16.9%

5.91%

1.88%

12.3%

2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂

This reaction uses 18.2 g of copper (I) sulfide. What volume of sulfur dioxide gas would be collected at 237°C and 10.7 atm?

0.446 L

57 L

0.207 L

0.21 L

Use the equation 2 Al + 3 Cl₂ ⟶ 2 AlCl₃. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant and state the theoretical yield of product.

Cl₂

2.0 mol AlCl₃

1.3 mol AlCl₃

10.

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen? Drag the correct subscript for each element

N (a) O (b)

Choose from the below words

11.

How many moles are in 16.94g of water?

16.94 mol H₂O

0.9401 mol H₂O

305.3 mol H₂O

1.063 mol H₂O

12.

What is the average atomic mass for this element?

10 amu

10.8 amu

19.9 amu

11 amu

13.

What is the empirical formula for a compound that contains 2.25 mol of oxygen, 0.75 mol of silicon, and 1.50 mol of potassium?

K₂SiO₃

KSiO₃

K₃SiO₄

K₄Si₂O₆

14.

Calculate the molar mass of Ba(C₂H₃O₂)₂

255.3 g/mol

237.3 g/mol

228.3 g/mol

196.3 g/mol

15.

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

C₂H₅

C₄H₁₀

C₁H_2.5

C₄H₈

16.

What is the percent composition by mass of sulfur in the compound MgSO₄, which has a molar mass of 120 g/mol)?

20.%

27%

46%

53%

17.

The particle model represents the reaction mixture after the complete combustion of a hydrocarbon. Which of the following could be the empirical formula of the hydrocarbon?

CH₃

CH₄

C₂H₅

C₂H₃

18.

Which pair has the same empirical formula?

NaCrO₄ and Na₂Cr₂O₇

C₂H₄O₂ and C₆H₁₂O₆

C₃H₆O₃and C₂H₆O₂

CH₄ and C₂H₆

19.

There are (a) moles in a 22g sample of argon.

(Enter your numerical answer with the correct number of significant figures.)

20.

How many grams are in 11.9 moles of chromium?

50.0 g

619 g

0.230 g

4.40 g

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AP Chem Stoichiometry Practice

Total questions: 20

Worksheet time: 1hrs 11mins

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