Empirical formula

An empirical formula:

• is the simplest whole-number ratio of moles of elements in the compound,

• is a formula that calculates the coefficients of a compound in a balanced equation.

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇

• C₂H₄O₂ and C₆H₁₂O₆

• C₃H₆O₃ and C₂H₆O₂

• CH₄ and C₂H₆

A 5.00 g sample of a compound consisting of calcium and chlorine contains 1.82 g of calcium and 3.23 g of chlorine. What is the empirical formula

• CaCl₂

• Ca₂Cl₂

• Ca₂Cl₄

• Ca₄Cl₂

A 154 g sample of a compound contains 15.01 g of C and 62.03 g of Cl. What is the empirical formula for this compound.

• CCl₃

• C₄Cl

• CCl₄

• CCl

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

• NO

• N₂O₄

• N₂O₃

• N₂O₅

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations.)

• SO

• SO₂

• SO₃

• SO₄

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

• Cu₃C₈

• Cu₂O

• CuO₄

• Cu₄O₁₀