Mixed Stoichiometry Practice

For the reaction represented by the equation Cl₂ + 2KBr → Br₂ + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?

• 749 g
• 225 g
• 479 g
• 814 g

Tags

NGSS.HS-PS1-7

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.

• AlCl3
• Cl2
• Al

Tags

NGSS.HS-PS1-7

CH₄ + 2H₂O --> CO₂ + 4H₂

What is the limiting reactant when 20 g CH₄ react with 15 g H₂O?

• CH₄

• H₂O

• CO₂

• H₂

Tags

NGSS.HS-PS1-7

Nitric acid can be neutralized by any base to form a salt and water, as in the following equation:

Mg(OH)₂ + 2 HNO₃ → Mg(NO₃)₂ + 2 H_­2O

How much magnesium nitrate salt will be formed by the reaction of 250. g magnesium hydroxide with 250. g nitric acid?

• 294 g

• 636 g

• 147 g

• 318 g

Tags

NGSS.HS-PS1-7

Tetraphosphorus decoxide combines with water to form phosphoric acid in the following unbalanced chemical equation:

P₄O₁₀ + H₂O → H₃PO₄

In order to form 100.0 g phosphoric acid, how much tetraphosphorus decoxide will you need?

• 289.7 g

• 138.1 g

• 262.6 g

• 72.42 g

Tags

NGSS.HS-PS1-7

2Fe₂O₃ + C → Fe + 3CO₂

You react 28.0 grams of carbon with excess Fe₂O₃. You find the actual yield to be 181.2 grams of CO₂. What is the percent yield of CO₂?

• 58.83%

• 308%

• 6435%

• 15.5

P₄ + 6Cl₂ --> 4PCl₃ 
The reaction of 75.0 g P₄ with excess chlorine gas produces 110 g PCl₃ in the lab. Calculate the percent yield for the reaction. 

• 78%
• 64%
• 27%
• 33%

Tags

NGSS.HS-PS1-7

How many grams of nitric acid, HNO₃, can be prepared from the reaction of 138 g of NO₂ with 54.0 g H₂O according to the equation below?

3NO₂ + H₂O → 2HNO₃ + NO

• 92.0

• 108

• 126

• 189

• 279

Tags

NGSS.HS-PS1-7

3CaCO₃ + 2FePO₄ --> Ca₃(PO₄)₂ + Fe₂(CO₃)₃

Assuming we start with 40.5 g of CaCO₃ and 45.0 g of FePO₄, identify the limiting reactant.

• iron(V) phosphate

• calcium carbonate

• iron(III) phosphate

• calcium(II) carbonate

Tags

NGSS.HS-PS1-7

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to react with 36.1 g of B₂H₆?

• 13.8 g O₂
• 3.86 mol of O₂
• 124 g O₂
• 108 g O₂

Tags

NGSS.HS-PS1-7