Stoichiometry

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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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

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

How many moles are in 19.82 g Mg? 

• 1.226mol Mg
• 481.7mol Mg
• 1.000mol Mg
•  0.82 mol Mg

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NGSS.HS-PS1-7

2CO  +  O₂  −-> 2CO₂
How many liters of carbon dioxide are produced from 10L of carbon monoxide?

• 10
• 20
• 1
• 5

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NGSS.HS-PS1-7

How many liters of NH₃ are needed to react completely with 30.0L of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• 5.0 L
• 20.0 L
• 7.5 L
• 120.0 L

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NGSS.HS-PS1-7

2Al + 6HCl --> 2AlCl₃ + 3H₂

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

• 13

• 8.8

• 0.99

• 1.0

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NGSS.HS-PS1-7

1Mg + 2H₂O --> Mg(OH)₂ + H₂

What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium?

• 62.0 L

• 0.12 L

• 2.77 L

• 1.15 L

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NGSS.HS-PS1-7

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³

What is the mole ratio in the following reaction:
2CO  +  O₂  → 2CO₂

• 2:1:2
• 1:1:1
• 1:2:1
• Have no clue what a mole ratios is!!

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NGSS.HS-PS1-7