Standard Stoichiometry and Percent Yield Review

How many moles of H₂ are needed to react with 2 moles of N₂ according to the reaction?

N₂ + 3 H₂ → 2 NH₃

• 6

• 2

• 3

• 1

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If 12.00 moles of NaClO₃ react, how many moles of O₂ will be produced according to the reaction?

2 NaClO₃ → 2 NaCl + 3 O₂

• 12 moles of O₂

• 18 moles of O₂

• 9 moles of O₂

• 6 moles of O₂

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2Na + 2H₂O → 2NaOH+ H₂

How many grams of H₂ are produced if 120 g of Na are available?

• 5.2 g

• 2.6 g

• 690 g

• 45 g

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2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• 0.85 g
• 290 g
• 450 g
• 870 g

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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

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Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)

• 1,2,2,2
• 1,2,1,1
• 2,1,1,1
• 2,1,2,1

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

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

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4 Al + 3 O₂ –> 2 Al₂O₃  How much aluminum would be needed to completely react with 45 grams of O₂?

• 1.05 moles
• 3.75 moles
• 1.875 grams
• 1.875 moles

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Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

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What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?   P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ 

• 6:4
• 4:6
• 1:3
• 3:1