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# Chemistry: Molar Mass, Composition Percent and Empirical Formula

chemistry: molar mass, composition percent and empirical formula,
CuBr2 – find the % comp of Cu and Br

Calculate the percent by weight of each element present in sodium sulfate.

A 17.0 g sample of ammonia contains 14.0 g of nitrogen and 3 g of hydrogen. What % by mass is the Hydrogen?

An Iron oxide sample weights 71.8 g and is found to contain 16.0 g of oxygen.

What is the mass % of oxygen?

What is the mass % of iron?

What’s the empirical formula of a molecule containing 18.7% lithium, 16.3% carbon, and 65.0% oxygen?

The percentage composition of acetic acid is found to be 39.9% C, 6.7% H, and 53.4% O. Determine the empirical formula of acetic acid.

A 50.51 g sample of a compound made from phosphorus and chlorine is decomposed. Analysis of the products showed that 11.39 g of phosphorus atoms were produced. What is the empirical formula of the compound? 120 g of CO2 into moles of CO2

6 mol of Iron (III) oxide, into grams

400 g of Phosphorus Pentafluoride into moles how many moles of just Fluorine?

3.35 mol of magnesium chloride into grams

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Category: Sample Questions