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

Feb 3rd, 2012
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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:

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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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