How many grams of :
(a) Al are present in 0.2 mole of it,
(b) HCl are present in 0.1 mole of it?
(c) H2O are present in 0.2 mole of it,
(d) CO2 is present in 0.1 mole of it?
(a) 1 mole of aluminium has mass = 27 g
So, 0.2 mole of aluminium has mass = 0.2 × 27 = 5.4 g
(b) 0.1 mole of HCl has mass = 0.1× 36.5 (mass of 1 mole)
= 3.65 g
(c) 0.2 mole of H2O has mass = 0.2 × 18 = 3.6 g
(d) 0.1 mole of CO2 has mass = 0.1 × 44 = 4.4 g