Pleae help me solve the following questions :
1. Complete combustion of 1.86g of an organic compound gave 2.64g of
carbon dioxide and 1.62g of water as the only products. If the density of the
compound at s.t.p. was found to be 2.77 g/dm^3, find its molecular formula.
2. A compound Z contained only nitrogen, hydrogen and chlorine. On
quantitative decomposition in aqueous solution, 3.17g of Z liberated 1109cm^3 of nitrogen at room conditions. Addition of aqueous silver nitrate to a solution
containing 1.585g of Z caused the formation of 3.315g of silver chloride.
Deduce the simplest formula of Z.
3. Molar aqueous solutions of BaCl2 and a metal sulphate of molar mass 342g
were prepared.
(a). What mass of anhydrous BaCl2 would be needed to prepare 250cm^3 of a molar solution?
(b). A white precipitate was formed when the two solutions were mixed. What is
this white precipitate?