Stoichiometry Lab Questions

Stoichiometry seeks to answer the question:

• Why?
• How much?
• What type?
• When?

In the lab you just did with baking soda:

2 NaHCO₃ --> C₂H₃NaO₂ + CO₂ + H₂O

what type of reaction was this?

• single replacement

• combustion

• synthesis

• decomposition

If 25 grams of NaHCO3 (Baking Soda 84 g/mole) is reacted in this lab, how many grams of the solid product would theoretically be produced (Sodium Acetate 82 g/mole)?

• 15.9 grams

• 31.8 grams

• 12.45 grams

• 24.4 grams

Tags

NGSS.HS-PS1-7

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

• 1.16%
• 116%
• 85%
• 76%

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%

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

• Write a balanced equation
• Panic
• Convert grams to moles
• Use Avogadro's number

What is the mass of 2 moles of propane (C3H8)?  (C=12 g/mol; H = 1 g/mol)

• 44 g
• 88 g
• 22 g
• 13 g

Tags

NGSS.HS-PS1-7

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

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

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