3.2g of hydrocarbon P (a compound contains carbon atom and hydrogen atom
only) is burnt completely to produce 8.8g of carbon dioxide. The simplest
formular of P is
A. CH4
B. C2H2
C. CH3
D. C2H6
Urgent about reacting mass !!! (Chem)
2008-10-27 3:04 am
回答 (1)
2008-10-27 3:24 am
✔ 最佳答案
The answer is A.
Relative molar mass of C = 12 g mol-1
Relative molar mass of H = 1 g mol-1
Relative molar mass of O = 16 g mol-1
Relative molar mass of CO2 = 12 + 16x2 = 44 g mol-1
Mole fraction of C in CO2 = 12/44
In 3.2 g of hydrocarbon P:
Mass of C = 8.8 x (12/44) = 2.4 g
Mass of H = 3.2 - 2.4 = 0.8 g
Mole ratio C : H
= 2.4/12 : 0.8/1
= 0.2 : 0.8
= 1 : 4
Hence, the simplest formula of P is CH4.
=
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