Some Basic Concepts Of Chemistry Subjective Type

Calculate the molecular mass of the following: 

1: H2O

2: co2

3: CH4

Calculate the mass percent of different elements present in sodium sulfate (Na2SO4).

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 the 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 (CH3 COONa) required to make 500 ml of 0.375 molars aqueous solution. The molar mass of sodium acetate is 82.0245 g mol-1

Calculate the concentration of nitric acid in moles per liter in a sample that has a density, 1.41 g mL-1 and the mass percent of nitric acid in it being 69%.

How much copper can be obtained from 100 g of copper sulfate (CuSO4)?

Determine the molecular formula of an oxide of iron in which the mass percent of iron and oxygen are 69.9 and 30.1 respectively. Given that the molar mass of the oxide is 159.69 g mol–1.

Calculate the atomic mass (average) of chlorine using the following data: