Question

A 2.500g sample of compound containing only Carbon and Hydrogen is found containing 2.002g of Carbon. Determine the empirical formula of the compound.​

Answer 1

The empirical formula : CH₃

Further explanation

Given

2.5 g sample

2.002 g Carbon

Required

The empirical formula

Solution

Mass of Hydrogen :

= 2.5 - 2.002

= 0.498

Mol ratio C : H :

C : 2.002/12 = 0.167

H : 0.498/1 = 0.498

Divide by 0.167 :

C : H = 1 : 3

Answer 2

The empirical formula of the given sample containing only Carbon and Hydrogen is CH₃.

What is empirical formula?

Empirical formula of any compound tells about the relative proportion of the constituents of that compound.

Given mass of compound = 2.5 g

Given mass of carbon = 2.002G

Mass of hydrogen = 2.5 - 2.002 = 0.498

Molar ration will be find by dividing the given mass by molar mass as:

C:H

2.002/12 : 0.498/1

0.167 : 0.498

Now we divide the upper quantities with the least obtained value as:

C:H

0.167/0.167 : 0.498/0.167

1 : 3

Hence, the empirical formula is CH₃.

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