Percent Composition

Front

What is the percent by mass of oxygen in MgO?

Back

40%

Front

What is the percent by mass of magnesium in MgO? Options: 20%, 40%, 50%, 60%

Back

60%

Front

What is the percent by mass of fluorine in CaF₂ (gram-formula mass = 78 g/mol)? Options: 24%, 49%, 51%, 65%

Back

49%

Front

Percent composition by mass of sulfur in MgSO₄ (gram formula mass = 120 g/mol)? Options: 20%, 27%, 46%, 53%

Back

27%

Front

Percent composition by mass of oxygen in MgSO₄ (gram formula mass = 120 g/mol)? Options: 20%, 27%, 46%, 53%

Back

53%

Front

In which compound is the percent composition by mass of Cl equal to 42%? Options: HClO (gram formula mass = 52 g/mol), HClO₂ (gram formula mass = 68 g/mol), HClO₃ (gram formula mass = 84 g/mol), HClO₄ (gram formula mass = 100 g/mol)

Back

HClO₃ (gram formula mass = 84 g/mol)

Front

Find the percent composition of Cu₂S?

Back

%Cu= 79.854   %S= 20.145

Front

Percent composition of Benzene, C₆H₆?

Back

C = 92.2%
H = 7.8%

Front

Empirical formula for Pb₅Cr₅O₂₀

Back

PbCrO₄

Front

Which element has an abundance of 39.03% in the compound sodium phosphate, Na₃PO₄? Options: Na, P, O, None of the above

Back

O