Question

13. Naphthalene contains 93.75% C and the rest hydrogen. Molecular mass of naphthalene is 128 Find its empirical formula. (a) C5H4 (b) C6H (c) C5H10 (d) C5
H2​

Answer 1

Answer:

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Answer 2

Answer:

Mass of carbon =93.71

Mass of hydrogen =6.29

Number of mole (carbon) =

12

93.71

=7.8

Number of mole (hydrogen) =

1

6.29

=6.29

Hence most simple ratio, for carbon

6.29

7.8

=1.25

for hydrogen,

6.29

6.29

=1

since, it is not a whole number we multiply the ratio by 5 to get a whole number ratio.

Lowest whole number ratio is

for carbon =5

for hydrogen =4

Empirical formula =C

5

H

4

Ratio =

64g

128g

=2

molecular formula

=2×C

5

H

4

=C

10

H

8

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