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Select the correct answer.
A compound has a molecular weight of 112.124 atomic mass units and the empirical formula C3H4O. What is the molecular formula of the compound? Use the periodic table to help you.

A.
C6H8O
B.
C9H12O3
C.
C8H4O2
D.
C4H8O2
E.
C6H8O2

.

Respuesta :

Answer:

E

Explanation:

The empirical formula has a mass of

3*C = 3*12 = 36

4*H = 4*1   =   4

1*O = 1 * 16 = 16                   Add

Total =          56

The actual mass of the molecule in nature is 112

Multiplier = nature's mass /  empirical formula mass

Values

Nature's mass = 112

Empirical mass = 56

Solution

Multiplier = Natures mass/Empirical Mass

Multiplier = 112  / 56

Multiplier = 2

Formula

Nature's formula = (Emperical Mass)_multiplier

Nature's formula = (C3H4O)_2                             Multiply

Nature's formula = C6H8O2

Check

C6 = 6*C = 6*12 = 72

H8 = 8*H = 8*1 =    8

O2 = 2*O = 2*16 = 32  Add

Total                      112  which checks with what is given.