A compound with the empirical formula CH2 has a molar mass of 28 g/mol. What is the molecular formula for this compound?
Answer:
The molecular formula is \(\mathrm{C}_{2} \mathrm{H}_{4}.\)
Explanation:
Determine the empirical formula mass.
\(\mathrm{CH}_{2}:(1 \times 12 \mathrm{~g} / \mathrm{mol})+(2 \times 1 \mathrm{~g} / \mathrm{mol})=14 \mathrm{~g} / \mathrm{mol}\)
Divide the molecular mass by the empirical formula mass.
Multiply the subscripts in the empirical formula times \(2\)
The molecular formula is \(\mathrm{C}_{2} \mathrm{H}_{4}\).