Answer to Question #93777 in General Chemistry for sher

Question

What mass of oxygen is needed to produce 75.0 grams of NO2?

Answer 1

2 atoms of oxygen are required for producing 1 $NO_2$ molecule

Molar mass of $NO_2=14+(2\times16)=46\frac{g}{mol}$

So,

$46 g$ $NO_2$ is produced by $32g$ oxygen

$75g$ $NO_2$ is produced by $\frac{32}{46}\times 75=52.174g$ oxygen

mass of oxygen needed to produce 75.0 grams of $NO_2=52.174g$