Calculate the quantity of pure gold in 100gm of an alloy of gold and copper of relative density 16. Given :relative density of gold =19 and relative density of coper=9.

A body weights 250gm wt In air and 150gm with water . Find relative density of body ?

Gold crystallizes in a face centred unit cell . Determine the density of gold (Given : Atomic mass of gold = 197 , atomic radius = 0.144 nm)

A body weights 7.55gm in air, 5.17gm in water and 6.35 gm in liquid . Calculate the relative density of the body and also that of liquid.

1 cc of lead ( relative density 11.4) and 21 cc of wood ( relative desity 0.5) are mixed together . Show weather the combination will float or sink in water.

Find the quantity of electricity needed to plate a metal of 100 cm^2 area and 10^-2cm thickness using CuSO_4 solution. (density of copper = 9.94 gm//cm^3 and atomic mass = 63.5)

What do you mean by relative lowering of vapour pressure? Calculate the relative lowering of Vapour pressure of a solution formed by dissolving 50 g of urea (NH_2 CONH_2) in 850g of water.(Given vapour pressure of pure water at 298K= 23.8mm of Hg.)

A copper wire of 2.5 xx 10^-6 m^2 area carries a current of 1.6A. If the number density of the electrons in the wire is 8 xx 10^28//m^3 , then calculate the drift speed of the electrons in the wire (e = 1.6 xx 10^-19 C)