Calculating Empirical Formula

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

• NO

• N₂O₃

• N₂O₄

• N₂O₅

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.
• is the simplest whole-number ratio of moles of elements in the compound.

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?

• Cu₃O₈
• CuO₄
• Cu₂O
• Cu₄O₁₀

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

• CaCl₂

• Ca₂Cl₄

• Ca₂Cl₂

• Ca₄Cl₂

Tags

NGSS.HS-PS1-7

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

• CCl₄

• C₄Cl

• CCl

Find the empirical formula of a compound containing 32.0 g Br and 4.9 g of Mg.

• MgBr

• MgBr2

• Mg2Br

• Mg2Br2

A compound was analyzed and found to contain 9.8 g of N, 0.70 g of H, and 33.6 g of O. Determine the empirical formula of the compound.

• HNO

• HNO2

• HNO3

• HNO4

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.

• CH2O

• CHO

• CHO2

• C2H2O

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 (P) were produced. What is the empirical formula of the compound?

• PCl

• PCl2

• PCl3

• PCl5

Tags

NGSS.HS-PS1-7