M H2SO4= 2×A H + A S +4× A O =2×1+32+3×16=2+32+48=82 g (82 g/mol)
1 mol H2SO4............ 82 g
x moli H2SO4........... 49 g
1/x= 82/49=>x=82/49=1,6 moli
1 mol H2SO4........... 6,023×10²³ molecule
1,6 moli H2SO4,........ x molecule
1/6=6,023×10²³/x = >x= 1,6×6,023×10²³ =9,6368 × 10 ²³ molecule
