MOLECULE

1) How many molecules are in:

a) 0.71g of chlorine gas. Take Avagadro's number as 6x10²².   6x 10²¹

b) 3.65g of HCl gas. (A. N= 6x10²³).    6x 10²²

c) 

2) calculate the weight of:

a) 10.0 atoms of sodium (1 a m.u= 1.6603x1/10²⁴g).            3.82/10²²

b) 2x10²³ molecules of copper sulphate. (A. N= 6x10²³).       5.33

c) 4x 10²⁴ molecules of SO₂.   0.3012 x 10²³.

3) Find the number of hydrogen atoms in 0.1 mole of H₂SO₄.