Stoichiometry Part 1

What is the measured amount of a product obtained from a chemical reaction?

• mole ratio
• theoretical yield
• percentage yield
• actual yield

Tags

NGSS.HS-PS1-7

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

Tags

NGSS.HS-PS1-7

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield
• mole ratio
• actual yield
• percentage yield

Tags

NGSS.HS-PS1-7

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

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

Tags

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%

• 1.21%

• 121.78%

2H₂ + O₂ → 2H₂O

How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles

• 8 moles

• 16 moles

• 2 moles

N₂ + 3H₂ → 2NH₃

How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6 mol

• 2 mol

• 3 mol

• 1 mol

What is the molar mass of C₆H₁₂O₆?

• 180.18 g/mol

• 180.12 g/mol

• 180.24 g/mol

• 180.06 g/mol

What is an excess reactant?

• amount you end with

• what you run out of first

• what you have left over

• what you start with

Tags

NGSS.HS-PS1-7