Stoichiometry Review

Use the balanced equation and the Molar Mass table above to answer the following question.

How much Ca₃(PO₄)_2(s) could be produced in an industrial process if 55.00 g of CaCl₂ in solution reacted completely with sufficient Na₃(PO₄)_(aq)?

• 310.2 g

• 155.1 g

• 103.4 g

• 51.70 g

Carbon tetrachloride is a solvent which is used as a refrigerant and also as a cleaning agent. Today, methane and chlorine are mainly used to produce carbon tetrachloride:

CH₄ + 4Cl₂ → CCl₄ + 4HCl

How many grams of carbon tetrachloride can be produced from reacting 709.0 grams of chlorine (Cl₂) with excess methane?

• 3.845 g

• 61.53 g

• 384.5 g

• 6153 g

Tags

NGSS.HS-PS1-7

For the reaction HCl + NaOH → NaCl + H₂O which reactant is the limiting reactant given 100.0 g of sodium hydroxide and 100.0 g of hydrochloric acid?

• Hydrochloric acid

• Sodium hydroxide

• Sodium chloride

• Water

In the reaction A + B → C + D, if element B is in excess, then —

• A is the limiting reactant

• B is the limiting reactant

• C is the limiting reactant

• Both A and B are limiting reactants

Calcium hydroxide and hydrochloric acid react to form calcium chloride and water as shown in the chemical reaction. If the chemicals are present in exactly the correct ratios to fully use all of the ingredients, how many moles of water would be formed from 5 moles of HCl? Balance the equation first.

__ Ca(OH)₂ + __ HCl → __ CaCl₂ + __ H₂O

• 1 mole

• 2 moles

• 5 moles

• 10 moles

Use the balanced equation and the Molar Mass table to answer the following question.

Suppose 110.0 g of CaCl₂ in solution is mixed with 163.9 g of Na₃(PO₄) in solution. How much Ca₃(PO₄)_(s) would be produced?

• 310.2 g

• 155.1 g

• 103.4 g

• 51.70 g

In the reaction 2H₂ + O₂ → 2H₂O, how many moles of oxygen are required to fully react with 6.0 mol of hydrogen?

• 3.0 mol

• 6.0 mol

• 12.0 mol

• 18.0 mol

In the reaction 2RbNO₃ → 2RbNO₂ + O₂, how many moles of O₂ are produced when 5.0 mol of RbNO₃ decompose?

• 1.0 mol

• 2.5 mol

• 3.0 mol

• 7.5 mol

Tags

NGSS.HS-PS1-7

In 1860, Robert Boyle was the first to use phosphorus to ignite sulfur-tipped wooden splints that gave rise to our modern matches. One of the ways it can be made involves the chemical reaction of calcium phosphate with carbon and silicon dioxide in a furnace:

2Ca₃ (PO₄ )₂ + 6SiO₂ + 10C → 6CaSiO₃ + P₄ + 10CO

Refer to the information above. If you use 100.0 grams of calcium phosphate and an excess of silicon dioxide and carbon, how many moles of phosphorus will be produced?

• .1612 moles

• .3224 moles

• 15510 moles

• 1.551 moles

In the reaction 2H₂ + O₂ → 2H₂O, what is the mole ratio of hydrogen to water?

• 2 : 2

• 2 : 1

• 1 : 2

• 4 : 4