Hydrogen atoms contained in 1.50 g of glucose (C6H12O6) are 6.02×1022. Molecular mass of C6H12O6.=72.06g+12.096g+96g=180.156g. So 1.5 g is 0.008333 moles. Each molecule contains 12 atoms of Hydrogen. So, the answers: 6.023×1023×12×0.008333=6.02×1022 atoms.