(1) As given, 0.2 mole of CO2 gas.
Mass = number of moles x molar mass
1 mole of CO2 = 44 g
0.2 moles of CO2 = 44 x 0.2 = 8.8g
(2) As given, 3.01 x 1023 molecules of water.
1 mole of H2O contains 6.023 x 1023 molecules.
6.023 x 1023 molecules of H2O = 18g
3.01 x 1023 molecules of H2O = \(\frac{18\times3.01\times10^{23}}{6.0253\times10^{23}}\) = 8.99g.
(3) As given, 2.24 L SO2
1 mole of gas ocupies 22.4 L volume at N.T.P.
22.4 L of SO2. gas = 64g
2.24 L of SO2. gas = \(\frac{64\times2.24}{22.4}\) = 6.4g
(4) As given, 20 g calcium
Mass of calcium = 20g
Thus, the highest mass is possesses by 20 g calcium and option(4) is correct.