Question

What is the percent by mass of oxygen in `Mg(NO_3)_2`?

Answer 1

`%O~=65%`

Explanation:

`"Percentage oxygen"` `=` `"Mass of oxygen"/"Molar mass of compound"xx100%`

`(6xx15.999*g*mol^-1)/(148.32*g*mol^-1)xx100%=??`