Oblicz mase cząsteczkowa pentanu i heksanu  

C5H12 masa: (12u x 5) + (1u x 12) =72u   C6H14 masa: (12u x 6) + (1u x 14) =86u

Pentan: 5*12u+12*1u=72u Heksan: 6*12u+14*1u=86u