n(niu)= m/M= 19,6g/98g/mol=0,2molH2SO4
1mol molec..........Na molecule(numarul lui Avogadro)
0,2mol.....................N= 0,2Na= 0,2x6,023x10²³molec=1,2x10²³molec H2SO4
1molecH2SO4.....2molecH...... .1molecS.....................4molecO
1,2x10²³...........x=2,4x10²³molec.......y=1,2x10²³molecS.....z=4,8x10²³molecO
