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QUESTION

# How can I calculate the mass percent of carbon, nitrogen and oxygen in acetamide, C_2H_5NO?

The mass percent of a molecule shows the amount each element contributes to the total molecular mass.

The first step in determining the mass percent of a given molecule is to determine each of the molecule component atoms' . Since acetamine is composed of carbon, nitrogen, oxygen and hydrogen, we get

Molar mass_(carbon) = 12.0 g/mol Molar mass_(nitrog en) = 14.0 g/mol Molar mass_(o xyg en) = 16.0 g/mol Molar mass_(hydrog en) = 1.00g/mol

Each element's mass contribution is determined by multiplying the number of atoms of a certain element with its molar mass

Carbon contributes 2 * 12.0 = 24.0 g/mol;Nitrogen contributes 1 * 14.0 = 15.0 g/mol;Oxygen contributes 1*16.0 = 16.0 g/mol;Hydrogen contributes 5*1.00 = 5.00 g/mol

Adding each element's contribution gives us the molecule's total

molarmass_(C_2H_5NO) = 24.0 + 15.0 + 16.0 + 5.00=59 g/mol

The final step to determining the molecul's mass percent is to divide each elemnt's contribution by acetamide's molar mass and to multiply the result by 100%

Mass percent of Carbon = 24.0/59.0 * 100% = 40.7% Mass percent of Nitrogen = 14.0/59.0 * 100% = 23.7% Mass percent of Oxygen = 16.0/59.0 * 100% = 27.1% Mass percent of Hydrogen = 5.00/59.0 = 8.50%

Always check the validity of the answer by adding up all the percentages

40.7 + 23.7 + 27.1 + 8.50 = 100%

So, acetamide is 40.7% Carbon, 23.7% Nitrogen, 27.1% Oxygen, and 8.5% Hydrogen...

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