Question

Find the number of moles of $N{O}_2$ molecules in a sample containing $3.011\times {10}^{23}$ molecules of $N{O}_2$.

• A. 0.05 moles
• B. 0.5 moles
• C. 2 moles
• D. 0.25 moles

Answer 1

The correct option is B 0.5 moles

We know,
$6.022\times {10}^{23}$ molecules of $N{O}_2=1$ mole of $N{O}_2$
So, $3.011\times {10}^{23}$ molecules of $N{O}_2$
$=\frac{3.011\times {10}^{23}}{6.022\times {10}^{23}}$ moles = 0.5 moles of $N{O}_2$