Chemistry Question on Some basic concepts of chemistry

Question

NO reacts with $O_2$ to form $NO_2$ . When 10 g of $NO_2$ is formed during the reaction, the mass of $O_2$ consumed is

Answer 1

Solution

$2NO+ \underset{\text{32 g}}{ {O_{2}}}\to \underset{\text{2$ \times $46 g}}{ {2 NO_{2}}}$ $92\,g \, NO_{2}$ uses $O_{2}=32\,g$ $\therefore 10\,g \,NO_{2}$ uses $O_{2}=3.48\,g$