Question

How do you calculate the percentage composition of Iodine in `NI_3`?

Answer 1

The percent composition of iodine in nitrogen triioxide is `32.1506%~~32%"`.

Explanation:

In order to calculate the percent composition of an element in a compound, you need to divide the molar mass (MM) of the element by the MM of the compound then multiply by 100.

`%"composition of element"=("MM of element")/("MM of compound")xx100`

`"MM of Iodine=126.90447 g/mol"`
https://en.m.wikipedia.org/wiki/Iodine

`"MM of NI"_3="394.719 g/mol"`
https://en.m.wikipedia.org/wiki/Nitrogen_triiodide

Percent Composition of Iodine in Nitrogen Triiodide

`%"composition I"=(126.90447 cancel"g/mol")/(394.719 cancel"g/mol")xx100="32.1506%"~~32%"`