Question

EXERCISES
1.1
1.2
1.3
1.4
Calculate the molar mass of the following:
(1) H,O (ü) CO, (iii) CH,
Calculate the mass per cent of different elements present in sodium sulphate
(Na, SO.).
Determine the empirical formula of an oxide of iron which has 69.9% iron and
30.1% dioxygen by mass.
Calculate the amount of carbon dioxide that could be produced when
(i) 1 mole of carbon is burnt in air.
(ii) 1 mole of carbon is burnt in 16 g of dioxygen.
(iii) 2 moles of carbon are burnt in 16 g of dioxygen.
Calculate the mass of sodium acetate (CH,COONa) required to make 500 ml
0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g mol-
Calculate the concentration of nitric acid in moles per litre in a sample whic
has a density, 1.41 g mL- and the mass per cent of nitric acid in it being 69%
How much copper can be obtained from 100 g of copper sulphate (CuSOL ?
Determine the molecular formula of an oxide of iron in which the mass per cer
of iron and oxygen are 69.9 and 30.1 respectively.
Calculate the atomic mass (average) of chlorine using the following data :
% Natural Abundance Molar Mass
1.5
1.6
.8
CO​

Answer 1

Answer:

1.2

1.3

1.4

Calculate the molar mass of the following:

(1) H,O (ü) CO, (iii) CH,

Calculate the mass per cent of different elements present in sodium sulphate

(Na, SO.).

Determine the empirical formula of an oxide of iron which has 69.9% iron and

30.1% dioxygen by mass.

Calculate the amount of carbon dioxide that could be produced when

(i) 1 mole of carbon is burnt in air.

(ii) 1 mole of carbon is burnt in 16 g of dioxygen.

(iii) 2 moles of carbon are burnt in 16 g of dioxygen.

Calculate the mass of sodium acetate (CH,COONa) required to make 500 ml

0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g mol-

Calculate the concentration of nitric acid in moles per litre in a sample whic

has a density, 1.41 g mL- and the mass per cent of nitric acid in it being 69%

How much copper can be obtained from 100 g of copper sulphate (CuSOL ?