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An hydrocarbon of relative molecular mass 70 was found to contain 85.7% carbon.

Subject

Chemistry

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Homework

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An hydrocarbon of relative molecular mass 70 was found to contain 85.7%
carbon. Determine :
(a) The molecular formula
(b) The structural formula
Answer:
85.7% of the molecule is carbon, 0.857*70 = 59.99
Carbon has an atomic mass of 12 amu/atom so 59.99/12 = 4.999 ~ 5 carbon atoms
The rest (70-60=10) are hydrogen atoms, so the molecular formula is C
5
H
10
.
The structural formula is CH
2
=CH
2
-CH
2
-CH
2
-CH
3
or CH
3
-CH=CH-CH
2
-CH
3
.

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An hydrocarbon of relative molecular mass 70 was found to contain 85.7% carbon. Determine :(a) The molecular formula(b) The structural formulaAnswer:85.7% of the molecule is carbon, 0.857*70 = 59.99Carbon has an atomic mass of 12 amu/atom so 59.99/12 = 4.999 ~ 5 carbon atomsThe rest (70-60 ...
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