Mole ConceptHard
Question
When hydrocarbons are burnt completely in excess of oxygen gas, then
Options
A.Equal moles of CO2 and H2O are formed from alkenes.
B.More moles of H2O than CO2 are formed from alkanes.
C.More moles of CO2 than H2O are formed from alkynes.
D.More moles of CO2 than H2O are formed for any kind of hydrocarbon.
Solution
$\underset{\text{Alkane}}{C_{n}H_{n + 2}} + \left( \frac{3n + 1}{2} \right)O_{2} \rightarrow nCO_{2} + (n + 1)H_{2}O$
$\underset{\text{Alkene}}{C_{n}H_{2n}} + \left( \frac{3n}{2} \right)O_{2} \rightarrow nCO_{2} + nH_{2}O $$$\underset{\text{Alkyne}}{C_{n}H_{2n - 2}} + \left( \frac{3n - 1}{2} \right)O_{2} \rightarrow nCO_{2} + (n - 1)H_{2}O$$
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