Question

The total number of protons present in 124 g of $N{O}_3^{-}$ are:

• A. $124N_A$
• B. $62N_A$
• C. $31N_A$
• D. $62N_A$

Answer 1

The correct option is B $62N_A$

Protons in $N{O}_3^{-}=31$
Moles of $N{O}_3^{-}=\frac{124}{62}=2$ mole
1 mole $N{O}_3^{-}=31N_A$ protons
2 mole $N{O}_3^{-}=62N_A$