Chemistry

Balancing Equations

Mole

Stoichiometry

Theoretical & Percent yield

Classifying Chemical Reactions

100

Balance the following equation below

__ N₂+__H₂ -> NH₃

1N₂+ 3H₂ -> 2NH₃

100

How many molecules are in 25.0 grams of NH3?

8.85 x 10²³ molecules NH₃

100

Silver nitrate reacts with barium chloride to form silver chloride and barium nitrate.

a. Write and balance the chemical equation.

b. If 39.02 grams of barium chloride are reacted in an excess of silver nitrate, how many representative particles (and what type) of silver chloride are produced?

a. 2 AgNO3 + BaCl2 -> 2 AgCl + Ba(NO3)2

b. 2.256 x 10²³ AgCl

100

5.96 g of ammonia (17.031 g/mol) react completely according to the following reaction:

2 NH₃ + CO₂ CN₂OH₄ + H₂O

What is the theoretical yield of urea

(CN₂OH₄ 60.056) for this reaction?

10.5 g

100

What type of reaction is this?

Al₂S₃ -> Al + S

decomposition

200

Balance the following equation below

_KCLO₃ -> _KCl + _O₂

2KCLO₃ -> 3KCl + 3O₂

200

How many molecules are in 25.0 grams of NH3?

107.5 g N2I6

200

Nitrogen gas is reacted with hydrogen gas to form nitrogen trihydride.

a. Write and balance the chemical equation.

b. How many liters of nitrogen trihydride are produced at STP if 80.28 grams of hydrogen gas are reacted in an excess of nitrogen?

a. N₂ + 3 H₂ -> 2 NH₃

b. 594.7 NH₃

200

A reaction with a calculated yield of 9.23 g produced 7.89 g of product. What is the percent yield for this reaction?

85.5%

200

What type of reaction is this?

C₄H₁₂ + O₂ -> H₂O + CO₂

combustion

300

Balance the following equation below

_S₈+ _O₂ -> _SO₃

1S₈+ 12O₂ -> 8SO₃

300

How many moles are in 3.4 x 1023 molecules of H2SO4?

0.56 mol H2SO4

300

For the following problem, use the following chemical equation:

a. Balance the chemical equation.

C₈H₁₈ + O₂ -> CO₂ + H₂O

b. How many moles of oxygen are needed to fully react 837.4 grams of C8H18?

a. 2C₈H₁₈ + 25O₂ -> 16CO₂ + 18H₂O

b. 91.63 moles O₂

300

9.87 g of ammonia (17.031 g/mol) react completely according to the following reaction:

2NH₃ + CO₂ CN₂OH₄ + H₂O If 13.74 g of urea (CN₂OH₄ 60.056 g/mol) are produced, what is the percent yield for this reaction (include theoretical yield also)

Theoretical yield : 17.4g

Percent yield: 79.0%

300

What type of reaction is this?

Cl₂ + KBr -> KCl + Br₂

single replacement

400

Balance the following equation below

_H₂ + _O₂ -> _H₂O

2H₂ + 1O₂ -> 2H₂O

400

How many grams are in 4.500 moles of Li2O?

134.6 g Li2O

400

Use the following balanced equation

2H₂+ O₂ -> 2H₂O

How many grams of water is produced from 9.00 mol of hydrogen gas?

162 g H₂O

400

85.4 g of chlorine (70.91 g/mol) reacts completely according to the following reaction:

P₄ + 6 Cl₂ 4 PCl₃ If 104 g of phosphorus trichloride (137.3 g/mol) is produced, what is the percent yield for this reaction? (include theoretical yield also)

Theoretical yield: 110g

Percent yield: 94.5%

400

What type of reaction is this?

Zn + S -> ZnS

synthesis

500

Balance the following equation below

_HNO₃+ _NaHCO₃ -> _NaNO₃ + _H₂O + CO₂

1HNO₃+ 1NaHCO₃ -> 1NaNO₃ + 1H₂O + 1CO₂

500

How many moles are in 25.0 grams of water?

1.39 mol H2O

500

1TiCl₄ + 2H₂O -> 1TiO₂ + 4HCl

Calculate the mass of HCl formed when 6.097 g of H₂O is reacted.

24.7 g HCl

500

15.4 g of methanol (CH₃OH 32.042 g/mol) reacts completely according to the following reaction: CH₃OH CH₂O + H₂ If 12.35 g of formaldehyde (30.026 g/mol) is produced, what is the percent yield for this reaction? (include theoretical yield also)

Theoretical yield: 14.4g

Percent yield: 85.8%

500

What type of reaction is this?

Al₂(SO₄)₃ + BaCl₂ -> BaSO₄ + AlCl₃

double replacement