Chapter 3: Stoich

Question 1

formal definition of a mole

Answer 1

a mole is equal to exactly 12g of pure C 12

Question 2

combustion reactions

Answer 2

burning converts hydrocrabons into CO2 and H2O using O2

Question 3

best way to find limiting reagent

Answer 3

find moles of each and divide by coefficient of that compound
smallest is limiting

Question 4

theoretical
actual
percent yield

Answer 4

theo, most possible product
act, what you actually get
percent yield, actual/theoretical

Question 5

how to find empirical formula 4 steps

Answer 5

1-pretend each percent given is a part of a 100g sample
2-covert each mass to moles
3-divide each moles by smallest mole
4- if fractional use multiply by factors

Question 6

how to find molarcular formula from empirical

Answer 6

find number of times the emp mass goes into mol mass
multiply by that number