Q 1
Calculate the number of calcium ions in 5.6 gram of calcium oxide
Q2 calculate the mass of 12.0 x 10 14atoms of hydrogen
Calculate the actual mass of : (a) an atom of oxygen,
(b) an atom of hydrogen, (c) a molecule fo NH3,
(d) the atom of silver (e) th emolecule fo oxygen (f) 0.25 gram atom of calcium.