Wood's metal contains `50.0%` bismuth, `25.0%` lead, `12.5%` tin and `12.5%` cadmium by mass. What is the mole fraction of tin ?(\ (Atomic mass : `Bi=209, Pb=207, Sn=119, Cd=112)`

An organic compound is found to contain C = 54.5%, 0=36.4% and H = 9.1% by mass. Its empirical formula is

Bell metal contains 80% copper . The mass of Bell metal which contain 1.5 xx 10^(20) atoms of copper is (Cu = 64)

An aqueous solution containing 5% by weight of urea and 10% by weight of glucose . What will be the DeltaT_(f) of the solution ( K_(f) for H_(2)O is 1.86^(0) K-molal)

A Solid contains 5 xx 10^(21) number of atoms. If an electron is removed from each of 0.01% of number of atoms, find the charge gained by this solid?

An oxide of metal (at . Wt = 112) contains 12.5% of oxygen by weight. What is the valency of metal? What mass of the metal will be liberated when the oxide is converted to chloride with HCl and electrolysed using a current of 9.65 amp for a period of 30 min?

Mole fraction of solute in some solution is 1//n . If 50% of solute molecules dissociate into two parts and remaining 50% get dimerised , new mole fraction of solvent becomes 4//5 . Find value of n.29. 0.1 M KI and 0.2 M are mixed in 3:1 volume ratio . The depression in freezing point of the resulting solution will be 0.1 x (Assume K_(f) of and molality =molarity). Then x=_________