A hydrocarbon consist of 92.3 carbon, if its vapor density is 39 determine its molecular formula?
回答 (1)
2016-07-20 9:07 am
I think "92.3 carbon" should be "92.3% carbon" instead.
Mole ratio C : H
= 92.3/12.0 : (100-92.3)/1.0
= 7.69 : 7.7
≈ 1 : 1
The empirical formula of the hydrocarbon = CH
Then, let (CH)ₓ be the molecular formula.
Relative molecular mass of the hydrocarbon :
(12.0 + 1.0) x = 39 × 2
13.0x = 78
x = 6
Hence, molecular formula of the hydrocarbon = C₆H₆
Mole ratio C : H
= 92.3/12.0 : (100-92.3)/1.0
= 7.69 : 7.7
≈ 1 : 1
The empirical formula of the hydrocarbon = CH
Then, let (CH)ₓ be the molecular formula.
Relative molecular mass of the hydrocarbon :
(12.0 + 1.0) x = 39 × 2
13.0x = 78
x = 6
Hence, molecular formula of the hydrocarbon = C₆H₆
收錄日期: 2021-04-18 15:19:25
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