Question

Nitric oxide, $NO$, reacts with oxygen gas to form nitrogen dioxide, a dark brown gas.
What mass of nitrogen dioxide could be produced from $20.3g$ of nitric oxide and $5.89g$ of oxygen gas?

• A. $16.9g$
• B. $8.46g$
• C. $33.9g$
• D. $62.2g$

Answer 1

Answer: (B)

$8.46g$

$NO+O_2\rightleftharpoons N{O}_2$

Given, mass of $NO=20.3g$

Mass of $O_2=5.89g$

$\Rightarrow$ No. of moles of $NO=\frac{20.3}{14+16}=\frac{20.3}{30}=0.61moles$

$\Rightarrow$ No. of moles of $O_2=\frac{5.89}{32}=0.184moles$

So, $O_2$ is limiting agent.

$\Rightarrow$ $1mole$ of oxygen produce$1mole$ of $N{O}_2$

$\Rightarrow$ $0.184mole$ of $O_2$ produce$0.184mole$ of $N{O}_2$

$\Rightarrow$ Mass of $N{O}_2=\left(0.184\right)(14+32)=8.46g$