percentage composition

The specific rotation of two glucose anomers are alpha = + 110^(@) and beta = 19^@ and for the constant equilibrium mixtures is +52.7^@ . Calculate the percentage compositions of the anomers in the equilibrium mixture.

An organic compound on analysis gave the following percentage composition : C = 57.8%, H = 3.6% and the rest is oxygen. The vapour density of the compound was found to be 83. Find out the molecular formula of the compound

Cuprous sulphide and silver sulphide are isomorphous. The atomic mass of Cu is 63.57 g/mole. If the percentage composition of Sulphur in each of these is 20.14% and 12.94% respectively then the atomic mass of silver will be:

Calculate the mass percentage of composition of sulphur in calcium sulphate, CaSO_(4) [Ca = 40, S= 32, O= 16]

What is the % composition of nitrogen by weight in air ?

0.50 g of a mixture of K_(2)CO_(3) and Li_(2)CO_(3) required 30 mL of 0.25 N HCl solution for neutralization. What is % composition of mixure?