Question

What is the percent composition of `H_2S`?

Answer 1

`5.88%, 94.12%` (2d.p.)

Explanation:

percent composition depends on relative atomic mass.

the percentage of component present in a compound is
(relative formula mass of component `div` relative formula mass of compound) `* 100%`

the relative atomic mass of `H` (hydrogen) is `1`
the relative formula mass of `H_2` is `2`.

the relative atomic mass of `S` (sulphur) is `32`.

`2 + 32 = 34`
the compound `H_2S` is known as hydrogen sulphide.

relative formula mass of `H_2` `div` relative formula mass of `H_2S`) `* 100% = 2/34 * 100%`

`= 5.88%` (2d.p.)

relative formula mass of `S` `div` relative formula mass of `H_2S`) `* 100% = 32/34 * 100%`

`= 94.12%` (2d.p.)

hence, the percentage composition of `H_2` and `S` is `5.88%, 94.12%` (2d.p.).