Question

One mole of a gas is defined as

(a) The number of molecules in one litre of gas

(b) The number of molecules in one formula weight of gas

(c) The number of molecules contained in 12 grams of ¹²C isotope

(d) The number of molecules in 22.4 litres of a gas at S.T.P.

Answer 1

Correct option is (d) The number of molecules in 22.4 litres of a gas at S.T.P.

A mole of any material will contain Avogadro's number of molecules.

One mole of an ideal gas will occupy a volume of 22.4 liters at STP (Standard Temperature and Pressure, 0°C and one atmosphere pressure).