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A. CALCULATING EMPIRICAL AND MOLECULAR FORMULA
Instruction: Solve the following problems.

1. Fuel composed of carbon and hydrogen atoms only has a percent composition of 81.7% C and 18.3% H. What is the empirical formula of the fuel?

2. A compound has a molar mass of 186 g/mol and has the formula C6nH5nOn where n is a whole number. What is its molecular formula?

B. WRITING AND BALANCING CHEMICAL EQUATION.
Instruction: Write balanced chemical equations for the following reactions.

1. Aqueous iron (III) chloride and sodium carbonate solution yields aqueous sodium chloride and precipitate of iron (III) carbonate.

2. Magnesium carbonate solution plus aqueous hydrochloric acid yields magnesium chloride solution plus liquid water and carbon dioxide.