Question

(14) 0.5 m2 are of a plate is coated with 0.005 cm thick layer of cobalt. Find number of atoms of cobalt used in this process. (density of cobalt : 9.5 g/cm3 and atomic mass ofCo = 59 nu)

(15) )Two elements A and B form two molecule AB^2 and AB. If 3 * l0^22 molecule of AB^2 weight l0 gm and 0.1 mol of AB let 12 gm. Find atomic weight of A and B.​

Answer 1

Hello Hello Hello Hello Hello