Stoichiometry Quest Review

What do you use when converting from moles of Fe to atoms of Fe?

• Coefficient Ratio

• Avogadro's Number

• Molar mass

• Conservation of Mass

2 Al + 3 H₂SO₄ -> Al₂(SO₄)₃ + 3 H₂

How many grams of aluminum sulfate would be formed if 250 g H₂SO₄ completely reacted with aluminum?

• 0.85 g

• 290 g

• 450 g

• 870 g

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When does a chemical reaction stop?

• When the lab is finished
• When the excess reactant is used up
• When the limiting reactant is used up
• Chemical reactions never stop

How many grams are in 7.8 moles of NaCl?

• 476 grams

• 460 grams

• 452 grams

• 462 grams

B₂H₆ + 3 O₂ -->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

B₂H₆ + 3 O₂ -->2 HBO₂ + 2 H₂O

How much H₂O will form if 6 molecules of O₂ are burned?

• 4 molecules H₂O

• 4 mol of H₂O

• 6 molecules H₂O

• 6 mol H₂O

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4 Al + 3 O₂ –> 2 Al₂O₃ How many moles of aluminum would be needed to completely react with 1.41 mol of O₂?

• 1.05 moles

• 3.75 moles

• 1.875 grams

• 1.875 moles

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2 NaClO₃ (s) → 2 NaCl (s) +3 O₂ (g)

How many grams of O₂ will be produced from 12.00 moles of NaClO₃?

• 256 g of O₂

• 576 g of O₂

• 288 g O₂

• 32 g O₂

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Using the following equation:

Fe₂O₃(s) + 3 H₂(g) → 2 Fe(s) + 3 H₂O(l)

How many moles of iron can be made from 6 moles H₂?

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

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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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