chem lec

Topics: Stoichiometry, Chemistry, Oxygen Pages: 0 (250 words) Published: August 28, 2014
Problem Set
Introduction to Stoichiometry

Name: ______________________________________________________ Course/Yr/Section: ____________ Date:_____________ Direction: Analyze and solve each problem carefully, write the solution on the space provided. Box your final answer/s. (10pts each) Determine the molar mass of the following:

a. Al(NO3)3

b. ZnSO4

c. Ba(C2H3O2)2

d. NaHCO3

CH3COOH
Calculate the percentage oxygen in the following compounds:
a. Na2CO3

b. BaSO4

c. BaO

d. Al2O3

e. H2SO4
Determine the empirical formula and the molecular formula of a compound containing 40.0% C, 6.7% H and 53.3% O. The molecular weight of the compound is 60.02g.

Calculate the percentage composition of a compound containing 27.93g Fe, 24.05g S, and 48.00g O.

How many grams of silver is present in 3.45g Ag2S?

Balance the chemical reaction:

____C3H8 + ____O2  ____CO2 + ____H2O

Suppose 1.5 moles of propane was consumed in the reaction, answer the next three problems.

How many grams is 1.5 moles C3H8 (propane)?

How many grams CO2 is formed?

How many molecules of H2O are formed?

If 6.75 moles of O2 and 3.25 moles C3H8 were combined, how many grams H2O will be produced? Which is the limiting reagent?

If 100 grams each of O2 and C3H8 were combined, how many moles CO2 will be produced? Which is the excess reagent? How much excess reagent will be left unreacted?

Calculate the theoretical yield, potassium chloride produced from the reaction of 2.56 g of K and 3.85 g Cl2. If an actual experiment produces 3.81 g KCl, calculate the percentage yield.
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