Odpowiedzi

2010-01-19T19:26:51+01:00
C₅H₁₂

mC₅H₁₂ = 5*12u + 12* 1u = 60u + 12u = 72u
60/72 * 100% = 83⅓ %
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2010-01-19T19:28:37+01:00
Pentan = C5H12
mC5H12 = 5*12 + 12*1 = 60+12= 72

C = 60/72 = 83, (3) %

Odp. Węgiel stanowi 83, (3)% pentanu.
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