Convert into mole. (a) 12 g of oxygen gas (b) 20 g of water (c) 22 g of carbon dioxide

Q.8:- Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide

 

Answer:-

(a) Molar mass of O2 = 2 x 16 = 32 g

Number of moles in 12g O2 = Given mass/ Molar mass = 12/32 = 0.375 mole

 

(b) Molar mass of H2O = 2 x 1 + 16 = 18g

Number of moles in 20 g H2O = 20/18 = 1.11mole

 

(c) Molar mass of CO2 = 12 + 16 x 2 = 12 + 32 = 44g

Number of moles in 22g CO2 = 22/44 = 0.5mole