Answers

1. Calculate the molecular formula of a compound with the empirical formula CH₂O and a molar mass of 150 g/mol. C₅H₁₀O₅

2. Acetylene gas is 92.3 % carbon and 7.7 % hydrogen (by mass), and its molar mass is 26 g/mol. What is its molecular formula? C₂H₂

3. The empirical formula of a compound is known to be CH₂, and its molar mass is 56 g/mol. What is its molecular formula? C₄H₈

4. A compound contains 12.8% C, 2.1 % H, and 85.1 % Br (by mass). Calculate the empirical formula and the molecular formula of this compound given the molar mass is 188 g/mol.

CH₂Br / C₂H₄Br₂