A hydrocarbon contains 4.8 g of carbon per gram of hydrogen. Calculate:

(a) the gram atom of each,

(b) find the empirical formula,

(c) find molecular formula, if its vapour density is 29.

0.2 g atom of silicon combine with 21.3 g of chlorine. Find the empirical formula of the compound formed.

In a compound of magnesium (Mg = 24) and nitrogen (N = 14), 18 g of magnesium combines with 7g of nitrogen. Deduce the simplest formula by answering the following questions.

(a) How many gram-atoms of magnesium are equal to 18g?

(b) How many gram-atoms of nitrogen are equal to 7g of nitrogen?

(c) Calculate simple ratio of gram-atoms of magnesium to gram-atoms of nitrogen and hence the simplest formula of the compound formed.

Barium chloride crystals contain 14.8% water of crystallisation. Find the number of molecules of water of crystallisation per molecule.