Calculate the number of molecules in 1 kg of sodium chloride. [Na = 23, Cl = 35.5].
(a) 1 mol wt. of NaCl = 58.5 g contains 6.022 × 1023
(b) Contains molecules = 1000/58.5 × 6.023 × 1023 = 102.96 × 1023 molecules.
