C-06-Q055mediumsingle_mcq18 g H2O\mathrm{H_2O}H2O contains how many H atoms?a2×6.023×10232 \times 6.023 \times 10^{23}2×6.023×1023b6.023×10236.023 \times 10^{23}6.023×1023c3×6.023×10233 \times 6.023 \times 10^{23}3×6.023×1023d0.5×6.023×10230.5 \times 6.023 \times 10^{23}0.5×6.023×1023