Question

What is the percent composition of hydrogen (H) in benzene (C6H6)?

Answer 1

That's the answer on that picture

Answer 2

Answer : The percent composition of hydrogen in benzene is, 7.69 %

Explanation: Given,

Molar mass of C = 12 g/mole

Molar mass of H = 1 g/mole

First we have to calculate the molar mass of benzene.

Molar mass of benzene
`(C_6H_6)` =
`6(12)+6(1)=78g/mole`

Now we have to calculate the percent composition of hydrogen in benzene.

As we now that there are 6 number of carbon atoms and 6 number of hydrogen atoms.

The mass of hydrogen =
`6* 1=6g`

Formula used :

`\%\text{ Composition of hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Molar mass of hydrogen}}* 100`

Now put all the given values in this formula, we get the percent composition of hydrogen in benzene.

`\%\text{ Composition of hydrogen}=(6)/(78)* 100=7.69\%`

Therefore, the percent composition of hydrogen in benzene is, 7.69 %