1.00 g of a hydrated salt contains 0.2014 g of iron, 0.1153 g of sulfur, 0.2301 g of oxygen and 0.4532 g of water of crystallisation. Find the empirical formula. (At. wt. : Fe = 56, S = 32, O = 16)

Find the percentage composition constituents green vitriol crystals (FeSO_4*7H_2O) . Also find out the mass of iron and the water of crystallisaion in iron and the water of crystallisation in 4.54 kg of the crystals. (At. mass : Fe = 56, S = 32, O = 16 )

The number of atoms present in 0.05 g of water is _____.

64g of an organic compound contains 24 g of carbon, 8gm of hydrogen and the rest oxygen. The empirical formula of the compound is

How many g of H_2 O are present in 0.25 mol of it ?

How many g of H_2O are present in 0.25 mol of it?

0.30g of an organic compound containing C, H , and O an combustion yields 0.44g of CO_(2) and 0.18g of H_(2) O . If its molecular mass is 60 mu the molecular formula will be

A 500 g toothpaste sample has 0.2 g fluoride concentration. What is the concentration of F^(-) in ppm ?

1.0 g of magnesium is burnt with 0.56 g O_(2) in a closed vessel. Which reactant is left in excess and how much? (At wt. Mg=24,O=16 )

2.0 g of a metal burnt in oxygen gave 3.2 g of its oxide . 1.42 g of the same metal heated in steam gave 2.27 of its oxide . Which law is varified by these data ?