Question

What is the percent of hydrogen by mass in CH4O? (H:1.00 amu, C: 12.01 amu, O: 16.00 amu)

Answer 1

The mass percent of hydrogen in CH₄O is 12.5%.

What is the mass percent?

Mass percent is the mass of the element divided by the mass of the compound or solute.

• Step 1: Calculate the mass of the compound.

mCH₄O = 1 mC + 4 mH + 1 mO = 1 (12.01 amu) + 4 (1.00 amu) + 1 (16.00 amu) = 32.01 amu

• Step 2: Calculate the mass of hydrogen in the compound.

mH in mCH₄O = 4 mH = 4 (1.00 amu) = 4.00 amu

• Step 3: Calculate the mass percent of hydrogen in the compound.

%H = (mH in mCH₄O / mCH₄O) × 100%

%H = 4.00 amu / 32.01 amu × 100% = 12.5%

The mass percent of hydrogen in CH₄O is 12.5%.

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