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Wzór ogólny alkanów: CnH2n+2
Wzór ogólny na mesę alkanów: 12n + 1(2n+1) = 12n + 2n + 2 = 14n + 2
14n + 2 = 72
14n = 70
n = 5
Wzór: C5H12 - pentan
CnH2n+2
12n+2n+2=72 ----> 12n, bo węgiel ma masę 12u
14n=70/14
n=5
Wzór to C5H12