Question

a compound contains 6.0 g of carbon and 1.0 g of hydrogen. the percent composition of compound is ? a) 14%hydrogen and 86% carbon b) 86% hydrogen and 14% carbon c)17% hydeogen and 83% carbon d) 83% hydrogen and 17% carbon​

Answer 1

Explanation:

Analysis by mass of a certain compound shows that it contains 14 % hydrogen and 86 % carbon. On the basis of the given data it can properly be made about the compound that its empirical formula is CH

2

.

100 g of compound will contain 14 g of hydrogen and 86 g of carbon.

The atomic masses of hydrogen and carbon are 1 g/mol and 12 g/mol respectively.

The number of moles is equal to the ratio of mass to atomic mass.

Number of moles of C=

12

86

=7.17 moles.

The number of moles of H =

1

14

=14.

The ratio of the number of moles of C to the number of moles of hydrogen is

14

7.17

≃

2

1

.

Hence, the empirical formula of the compound is CH

2

.

Answer 2

The composition of compound is a)14%hydrogen and 86% carbon.

Explanation:

mass of $C$ present in compound=$6g$

mass of $H$ present in compound=$1g$

total mass=$7g$

% composition of $C$= $\frac{6}{7}$

$=85.7$%

$=86$%

% composition of $H$= $\frac{1}{7}$

$=14.2$%

$=14$%.