27.18

32.50

41.25

54.35

$\,{\rm{1}}{{\rm{0}}^{{\rm{ - 3}}}}\,{\rm{mol}}\,\,{\rm{of}}\,{\rm{water}}$

${\rm{18}}\,{\rm{mL}}\,{\rm{of}}\,{\rm{water}}$

$\,{\rm{0}}{\rm{.00224}}\,{\rm{L}}\,\,{\rm{of}}\,{\rm{water}}\,{\rm{vapours}}\,\,{\rm{at 1 atm }}\,{\rm{and }}\,{\rm{273}}\,\,{\rm{K}}$

${\rm{0}}{\rm{.18}}\,\,{\rm{g}}\,\,{\rm{of}}\,\,{\rm{water}}$

CO2

O2

Air (approximately)

H2

18 ml of water

0.18 g of water

0.00224 L of water vapour at 1 atm and 273 K

${10^{ - 3}}$ mol of water

$26.9 imes {10^{18}}$ molecules

$2.69 imes {10^{19}}$ molecules

$2.69 imes {10^{18}}$ molecules

$26.9 imes {10^{19}}$ molecules