8.20.T - Lesson: Molecular Formulas & Hydrates Assessment

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Find the percent composition of water in barium chloride dihydrate. Round your answer to the nearest whole number.

17%

Name the following hydrate: FeSO4 · 9H2O

Iron(II) sulfate nonahydrate

The empirical formula of a compound is CH2. Which could NOT be the molecular formula?

C12H22

If the empirical formula of a compound is C2OH4, and the molar mass is 88 g/mol, what is the molecular formula?

C4O2H8

If the empirical formula of a compound is CH2, and the molar mass is 70.0 g/mol, what is the molecular formula?

C5H10

A sample of an unknown compound consists of 12.01 g C, 2.02 g H, and 16.0 g O, and has a molar mass of 180 g/mol. What is the molecular formula?

C6H12O6

Name the following hydrate: CuSO4 · 5H2O

Copper(II) sulfate pentahydrate

Write the formula for copper(II) sulfate hexahydrate.

CuSO4 · 6H2O

Write the formula for magnesium sulfate trihydrate.

MgSO4 · 3H2O

If the empirical formula of a compound is known, what is needed in order to determine the molecular formula?

The molar mass

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