How Many Hydrogen Atoms Are There in 12

How many hydrogen atoms are there in 12.4 g of Al₂(HPO₄) ₃?

A) 6.55 × 10^{22 H atoms}
B) 1.09 × 10^{22 H atoms}
C) 6.07 × 10^{22 H atoms}
D) 1.32 × 10^{23 H atoms}
E) 4.39 × 10^{22 H atoms}