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Stoichiometry (g-g practice)

Last updated about 5 years ago
4 questions
Note from the author:
Stoichiometry mass-mass practice
gram

HOMEWORK 19NOV20

DUE 20NOV20

Two videos I recommend for this homework are at the bottom.

Stoichiometry gram to gram

For each problem make a plan (can be on paper or on the HW, or in your head)
For all these problems the plan will be:

g given->mol given -> mol unknown -> g unkown


Tomorrow and in the future, you won't know that we are starting and ending with grams. You will need to determine the starting and ending units. Sometimes you will start in moles or end in moles, other times in molecules or liters.
1

3Ca(OH)2+2H3PO4→Ca3(PO4)2+3H2O

Use dimensional analysis to calculate how many grams of H2O will be produced if 111.5 grams of Ca(OH)2 are reacted.

Hint: You will need to find the molar mass of Ca(OH)2 and the molar mass of H2O.

1

2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

Using dimensional analysis calculate how many grams of CO2 are produced when 100 grams of butane, C4H10, gas are reacted.

Hint: You will need to calculate the molar mass of CO2 and C4H10

1

4Fe(s)+3O2(g)→2Fe2O3(s)

Use dimensional analysis to calculate how many grams of iron (iii) oxide, Fe2O3 are produced if 55 grams of iron are reacted.

Hint: You will need to calculate the molar mass of Fe2O3 and Fe

1

P4 + 6Cl2→ 4PCl3

Using dimensional analysis calculate how many grams of phosphorus, P4, are reacted if 250g of phosphorus trichloride, PCl3 , are produced