Stoichiometry

What is the mole ratio of CO₂ to H₂O in the equation below?
C₂H₆O+ 3 O₂-> 2 CO₂+ 3H₂O

• 44 grams CO₂/mol : 18 grams H₂O/mol
• 2 mol CO₂ : 3 mol H₂O
• 44 mol CO₂ : 18 mol H₂O
• 2 gram/mol CO₂ : 3 gram/mol H₂O

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2
• 4
• 6
• 8

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

 SiO₂ + 3C → SiC + 2CO

Add 8 moles of Carbon to the reaction. How many grams of Carbon Monoxide would theoretically be produced?

• 149 g

• 0.67 g
• 2.67 g
• 48 g

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

• 1.16%
• 116%
• 85%
• 76%

In the lab, the measured amount of a product obtained from a chemical reaction is called...

• mole ratio

• theoretical yield

• percentage yield

• actual yield

A chemist interested in the efficiency of a chemical reaction would calculate the...

• mole ratio

• rate of reaction

• percent yield

• energy released

Define: Excess Reagent (Reactant)

• amount of product at the end of a reaction

• amount of reactant that runs out first

• amount of reactant that remains after the reaction

• amount of reactant that you begin the reaction with

The ______________ yield is the maximum amount of product possible in a reaction. This determines the amount of product that should be produced in a perfect setting

• Percent
• actual
• stoichiometry
• theoretical

The limiting reactant

• slows the reaction down
• is used up first and determines the amount of product

• is the reactant that is left over
• controls the speed of the reaction