Final answer:
The molecular formula for the compound with an empirical formula of CH2 and a molecular mass of 56.1g is C4H8.
Step-by-step explanation:
The molecular formula for the compound with an empirical formula of CH2 and a molecular mass of 56.1g can be found by multiplying the empirical formula by a coefficient. To determine the coefficient, we divide the molecular mass by the empirical formula mass. The empirical formula mass can be calculated by multiplying the atomic masses of the elements in the empirical formula. In this case, the empirical formula mass is calculated as (12.01 g/mol * 1) + (1.008 g/mol * 2) = 14.03 g/mol. Dividing the molecular mass of 56.1g by the empirical formula mass of 14.03 g/mol gives a coefficient of 4. Therefore, the molecular formula for this compound is (CH2)4 = C4H8.