Question

How many moles of oxygen atoms are present in 1 gram molecule of $N_2{O}_5$?

• A. 1 mol
• B. 5 mol
• C. 2 mol
• D. 10 mol

Answer 1

The correct option is B 5 mol

$\text{1 gram-molecule of}{N}_2{O}_5=6.022\times {10}^{23}\text{molecules of}{N}_2{O}_5=\text{1 mole of}{N}_2{O}_5$

1 mole of $N_2{O}_5$ contains 5 moles of oxygen.
5 moles of oxygen atoms are present in 1 gram-molecule of $N_2{O}_5$.