Stoichiometry Review

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6
• 2
• 3
• 1

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NGSS.HS-PS1-7

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)  
12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g of O₂
• 576 g of O₂
• 288 g O₂

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol
• 1.0 mol
• 10.1 mol
• 4.5 mol

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NGSS.HS-PS1-7

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g
• 2.6 g
• 690 g
• 45 g

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NGSS.HS-PS1-7

2 CO (g) + O₂(g) → 2 CO₂ (g)
In the formation of CO₂ from CO and oxygen, how many Liters of CO₂ are produced by the reaction of 8 mols of O₂ with an excess of carbon monoxide?

• 0.178 L
• 358.4 Liters
• 704 grams
• 0.36 grams

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NGSS.HS-PS1-7

Fe (s) + S (l) --> FeS (s)  

In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?

• 14.8 g
• 12.2 g
• 13.7 g
• 19.9 g

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NGSS.HS-PS1-7

The calculation of quantities in chemical equations is called......

• Stoichiometry

• Dimensional Analysis

• Percent Composition

• Percent Yield

In a chemical reaction, the mass of products .........

• is less than the mass of the reactants

• is greater than the mass of the reactants

• is equal to the mass of the reactants

• has no relationship to the mass of the reactants

What is the mass of 2 moles of propane (C3H8)?  (C=12 g/mol; H = 1 g/mol)

• 44 g
• 88 g
• 22 g
• 13 g

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NGSS.HS-PS1-7

In the reaction, 2 CO(g) + O₂(g) --> 2 CO₂(g), what it the ratio of moles of O₂ used to moles of CO₂ produced?

• 1:1

• 2:1

• 1:2

• 2:2