Stoichiometry

Multiple Choice

100

The coefficients in a chemical equation represent the ______.

A.Relative number of moles of reactants and products

B.Masses in grams of all reactants and products

C.Number of atoms of each element in each compound in a reaction

A.Relative number of moles of reactants and products

200

What is stoichiometry? 

A.The study of plants and how they interact with their environments

B.Geometrical analysis of solutions

C.The study of the QUANTITATIVE relationships between reactants and products in a chemical reaction

C.The study of the QUANTITATIVE relationships between reactants and products in a chemical reaction

300

A balanced chemical equation allows you to determine the ______. 

A.Mole ration of any two substances in the reaction

B.Energy released in the reaction

C.Electron configuration of all elements in the reaction

A.Mole ration of any two substances in the reaction

400

Each of the four types of reaction stoichiometry problems requires using a?
A. table of bond energies.

B. chart of electron configurations. 

C. mole ratio.

C. mole ratio

500

Which of the following would not be studied within the topic of stoichiometry? 

A.The mole ratio of Al to Cl in the compound aluminum chloride

B.The number of moles of hydrogen that will react with a known quantity of oxygen

C.The amount of energy required to break the ionic bonds in CaF2

C.The amount of energy required to break the ionic bonds in CaF2

Mole-Mass Conversions

100

Find the number of moles of argon in 452g of argon

11.3 mol Ar

200

How many grams are in 3.45 moles of C0₂

151.8 g C0₂

300

What is the mass of 5 moles of Fe₂0₃

798.5 or 799 g

400

How many moles are in 28 grams of C0₂

0.64 mol CO₂

500

What is the mass of 3.987 mol of Al?

107.6 g Al

Mole-Particle Conversions (use Avogadro's number)

100

How many moles of magnesium are in 3.01 x 10²² atoms of magnesium?

0.05 mol

200

How many molecules are there in 4.00 moles of glucose, C₆H₁₂0₆ ?

2.41 x 10²⁴ molescules 

300

How many moles are 1.20 x 10²⁵ formula units of calcium iodide?

19.9 or 20 mol

400

How many formula units are in 12.5 moles of calcium phosphate?

7.525 x 10²⁴ 

500

 How many moles of carbon atoms is 4.72×10²⁴ atoms of carbon?

7.84 mol C

Mass to Mass

100

l) LiOH + HBr > LiBr + H₂0 

If you start with 10.0 grams of lithium hydroxide, how many grams of lithium bromide will be produced?

36.25g LiBr

200

2₂C₂H₄+3O₂ > 2CO₂+2H₂O

If you start with 45 grams of ethylene (C₂H₄), how many grams of carbon dioxide will be produced?

141.43g CO₂

300

Mg +2 NaF > MgF₂+2 Na 

If you start with 5.5 grams of sodium fluoride, how many grams of magnesium fluoride will be produced?

4.06g MgF₂

400

4) 2 HCI + Na₂SO₄ > 2NaCl + H₂SO₄

If you start with 20 grams of hydrochloric acid, how many grams of sulfuric acid (H₂SO₄) will be produced? 

27.2 g H₂SO₄

500

2KCIO₃ > 2KCI + 30₂

How many grams of potassium chloride, KCI, are produced if 25.0g of potassium chlorate, KC103, decompose?

15.2 g KCI