Match the following:

Column – I	Column – II
A) Avogadro number	1) Weighs 32 g
B) 18g of water	2) N
C) 22.4 litres of oxygen at STP	3) 1/12th of the mass of C-12 atom
D) 1 a.m.u	4) U
E) Unified mass	5) 1 mole of water

 Mole = gram molecular weight of the substance

1 mole of any gas occupies 22.4 lit or gram molecular weight of substance.

1 a.m.u is equal to the quantity of 1/12th of the mass of C-12 atom.

Avogardo’s number is indicated by ${\text{N}}_{\text{A}}$.

At STP 22.4 L of oxygen means 1 mol of oxygen that is equal to 32 g.