Chp 4 Stoichiometry

Question 1

What is a limiting reagent?

Answer 1

Reactant that is used up first in reaction (others are excess reagents)

Question 2

How to find limiting reagent?

Answer 2

Grams to moles to moles; when asked for mass of limiting reagent with other thing, use moles to grams of given qtty

Question 3

Difference between theoretical yield and actual yield?

Answer 3

Theoretical- all limiting reagent is reacted. MAX results

Actual- product that is realistically attained

Question 4

How to calculate percent yield?

Answer 4

(Actual/Theoretical) • 100%

Question 5

What is combustion look like?

Answer 5

—- + O2 -> H2O + CO2

Question 6

What is the deal when wanting to find empirical formula of combustion reaction?

Answer 6

*Find g of C and H via stoichiometry
*find O by
g of O=g of samp - (gC+gH)

Question 7

What’re the units of concentration?

Answer 7

mol/Liters

Question 8

Look at gravimetric analysis in Notes **

Answer 8

Please just do it

Question 9

Percent of a certain metal?

Answer 9

• Find percent of in the given compound product, multiply by actual mass of compound
• put answer over sample in problem.

Question 10

Fundamentals of stoichiometry?

Answer 10

Balanced Eq.

GRAMS to MOLES to MOLES to GRAMS

Question 11

What is concentration?

Answer 11

Mol/L