The Mass Of One litre sample Of ozonised oxygen At N.T.P Was Found To Be 1.5 G. When 100mL Of This Mixture At N.T.P Were Treated With Turpentine Oil, The Volume Was Reduced To 90mL Calculated The Molecular Mass Of Ozone. 

Insulin contains 3.4% sulphur. Calculate the minimum molecular mass of insulin.

 atoms of iron weigh as much as 1cc of H₂ at S.T.P. What is the atomic mass of iron?

4 g carbon were heated with 8 g of sulphur. How much carbon disulphide (CS₂) will be formed when the reaction is completed? What will be its percentage purity?  

How many years would it take to spend Avogadro’s number of rupees at the rate of 10 lakh rupees per second?

Gastric juice contains about 3.0 g of HCl per litre. If a person produces about 2.5litre of gastric juice per day, how many antacid tablets each  containing 400 mg of Al(OH)­₃ are needed to neutralize all the HCl produced in one day. 

What volume at N.T.P of ammonia gas will be required to be passed into 30mL of N H₂SO₄ solution to bring down the acid normality to 0.2 N?

The vapour density of a mixture of NO₂ and N₂O₄ is 38.3 at 26.7^oC. Calculate the number of moles of NO₂ in 100 g of the mixture.

7.4 gram of a metal hydroxide on heating gives 5.6 g of metal oxide. Calculate the equivalent weight of the metal.

How many molecules are there in 10 litres of gas at a pressure of 75 cm at 27 degree Celsius? 

Potassium bromide, KBr contains 32.9% by mass of potassium. If 6.40 g of bromine reacts with 3.60 g of potassium, calculate the number of moles of potassium which combine with bromine to from KBr.