Stoichiometry - Chem 1

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

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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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NGSS.HS-PS1-7

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%
• 0.82%
• 10.1 %
• 100%

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NGSS.HS-PS1-7

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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NGSS.HS-PS1-7

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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NGSS.HS-PS1-7

8.3 moles H₂ makes how many moles of H₂O?

2H₂ (_____) + O₂ (_____) −−〉 2H₂O (_____)

• 4.15

• 8.3

• 16.6

• 74.04

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NGSS.HS-PS1-7

What is the molar mass of CH₄

• 16.05
• 16.04
• 16.03
• 16.02

2H₂  +   O₂    −−〉 2H₂O
3.91 g O₂ −−〉g H₂O

• 1.905
• 4.4
• 2.2
• 1.1

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NGSS.HS-PS1-7

If you are going from grams of Na to grams of NaCl, what label is going to be on the bottom of the first step?
2Na   +   Cl₂  −−〉  2NaCl

• Grams Na
• Grams NaCl
• Moles Na
• Moles NaCl

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NGSS.HS-PS1-7

How many steps does a grams to grams problem have?

• 1
• 2
• 3
• 4