Question

(i) What is the mass of 0.2 mole of oxygen atoms?
(ii) What are poly atomic ions? Give examples.
(iii) Convert into mole:
(a) 22 g of carbondioxide
(b) 20 g of water

Answer 1

Answer:

(i) 0.2 mole of oxygen atoms = 16 × 0.2 = 3.2 g

(ii) Poly atomic ions are ions which consist of more than one atom. For example, nitrate ion, etc.

(iii) Convert into mole :

(a) 22 g of carbon dioxide = 0.5 mole  ( 1 mole = 44 g of CO2 )

(b) 20 g of water =  1.11 mole    ( 1 mole = 18 g of water )