Question

The empirical formula for a hydrocarbon is found to be CH₂. In a separate experiment, the molar mass is determined to be approximately 112 g mol. The number of hydrogens in the molecular formula of the hydrocarbon is therefore​

Answer 1

Answer:

Therefore the empirical Formula is P2O5 (c above). The empirical formula for a hydrocarbon is found to be CH2. In a separate experiment, the molar mass is determined to be approximately 112 g mol-1.

Answer 2

The number of hydrogens in the molecular formula of the hydrocarbon is - 16

In order to find the molecular formula from an empirical formula, one must find the ratio of their molecular masses.

• We know that the molecular mass of the molecule is 112 $gmol^{-1}$. We can calculate the molar mass of $CH_2$ from the periodic table:

C = 12.01  

H = 1.01  

= 14.03

So, to find the ratio by dividing the molecular mass by the empirical formula mass.

=$\frac{112}{14.03}$

= 7.98 or 8

That means we must multiply all the molecules by 8 in to reach the desired molar mass.

Hence: $(CH_2) \times 8 = C_8H_{16}$

Thus, The number of hydrogens in the molecular formula of the hydrocarbon is - 16

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