Question

Cqlculate number of neutrons in 5 g of D2o

Answer 1

Number of Moles of D2O in 5g=   5/20 = 1/4 moles
Number of Molecules in 1/4 moles of D2O = 1/4 × 6.022×10²³= 1.505ₓ10²³

Number of Neutrons in 1 molecule of D₂O= 1×2 + 8×1 Neutrons

Number of Neutrons in 5g D₂O = 1.505 ×10²³× 10
                                                       = 1.505×10²⁴ Neutrons Ans..