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Some Basic Concepts of Chemistry
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14/08/2021 10:24 am
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An ideal gaseous mixture of ethane (C2H6) and ethene (C2H4) occupies 28 litre at 1 atm and 273 K. The mixture reacts completely with 128 g O2 to produce CO2 and H2O. Mole fraction at C2H6 in the mixture is:
(a) 0.6
(b) 0.4
(c) 0.5
(d) 0.8
1 Answer
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14/08/2021 10:32 am
Correct answer: (b) 0.4
Explanation:
C2H6 + 3.5O2 → 2CO2 + 3H2O,
C2H4 + 3.5O2 → 2CO2 + 2H2O
Let volume of ethane is x litre,
22.4 × 4 = 3.5x + 3(28 – x)
⇒ x = 11.2 litre
at constant T and P, V ∝ n;
⇒ Mole fraction C2H6 of in mixture
= \(\frac{11.2}{28}\) = 0.4