percent composition

Front

What is the percent by mass of oxygen in MgO?

Back

40%

Front

What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

Back

27%

Front

Find the percent composition of Cu₂S?

Back

%Cu= 79.854   %S= 20.145

Front

What is the percent composition of Benzene, C₆H₆?

Back

C = 92.2%
H = 7.8%

Front

A compound consists of 72.2% magnesium (Mg) and 27.8% nitrogen (N) by mass. What is the empirical formula?

Back

Mg₃N₂ 

Front

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

Back

SO3

Front

A formula with the lowest whole # ratio of elements in a compound is called

Back

Empirical Formula 

Front

Reduce the molecular formula C₄H₈ to its empirical formula.

Back

C₂H₄

Front

Given an empirical formula C₂H₂ and a molecular mass of 78.12 g·mol, find the molecular formula.

Back

C₆H₆

Front

Given an empirical formula CH₂ and an experimentally measured molar mass 56.12 g·mol⁻¹, find the molecular formula.

Back

C₄H₈