Mole ConceptHard
Question
When hydrocarbons (alkanes, alkenes or alkynes) are burnt completely in excess of oxygen, then
Options
A.for the same number of carbon atoms, more oxygen is consumed for alkanes.
B.for the same number of hydrogen atoms, more oxygen is consumed for alkynes.
C.for the same number of carbon atoms, more water is formed from alkynes.
D.for the same number of hydrogen atoms, more CO2 is formed from alkynes.
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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