Question

One mole of any substance contain 6.022 atom molecules num of molecules of h2so4 present in 100mL of 0.02 M h2so4solution is

Answer 1

0.02M H2SO4 contains 0.02mol H2SO4 in 1.0L =1000mL(since 1M =1mol/litre) solution 

100mL solution will contain 0.02*100/1000 = 0.002 mol H2SO4 

1 mol H2SO4 contains 6.022*10^23 molecules 

0.002 mol H2SO4 contains 0.002*6.022*10^23 = 1.20*10^21 molecules.