Copper sulphide (Cus) contains 66.5 % Cu copper axide (CuO) contains 79.9% Cu and sulphur trioxide (SO_(3)) containts 40% S. Shows that these compounds obey the law of recipreocal proportions.

A certain non-volatile electrolyte contain 40% carbon, 6.7% hydrogen and 53.3% oxygen.An aqueous solution containing 5% by mass of the solute boils at 100.15^(@) C. Determine molecular formula of the compound( K_(b) =0.51^(@)C//m ):

A 0.276 g impure sample of copper ore is dissolved and Cu^(2+) is titrated with KI solution. I_(2) liberated required 40 mL of 0.1 M Na_(2) S_(2) O_(3) solution for titration. What is the % of impurities in the ore ?