Stoichiometry Review

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

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NGSS.HS-PS1-7

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

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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?

• 476grams
• 460 grams
• 452 grams
• 462 grams

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NGSS.HS-PS1-7

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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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

What is the first thing you must do to solve a stoichiometry problem?

• Make sure the chemical reaction is Balanced

• Panic

• Make sure the Equation is Unbalanced

• Multiple by Avogadro's Number

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

1 N₂ + 3 H₂ → 2 NH₃

• 6

• 2

• 3

• 1

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1 Cl₂ + 2 KBr → 1 Br₂ + 2 KCl

How many GRAMS of KCl can be produced from 356 g of KBr?

• 749 g

• 223 g

• 479 g

• 814 g

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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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NGSS.HS-PS1-7