If the percentage of H2SO4 be w/w then
!00g acid solution will contain 98g H2SO4 or 1 mole H2SO4
Or 100/1.8ml solution contains 1mole H2SO4
=> 1000ml solution will contain 1.8/100x1000 mole = 18mole H2SO4.
So 0,1 mole H2SO4 will be obtained in 100/18 ml =5.55 ml solution