Răspuns:
Explicație:
C5 H10
M= 5.12 + 10 .1= 70-------> 70g/moli
70 g C5 H10---------60g C--------10g H
100g-----------------------x----------------y
x= 100.60 : 70=85,71 % C
y= 100 . 10 : 70=14,29% H
