Chemistry
WAEC 2016
Consider the following reaction equation
C
2H
4(g) + 3O
2(g) \(\to\) 2CO
2(g) + 2H
2O
(l).
The volume of oxygen at s.t.p that will be required to burn 14g of ethene is
[C
2H
4 = 28; Molar volume of gas at s.t.p = 22.4dm
3
-
A.
64.2dm3
-
B.
33.6dm3
-
C.
11.2dm3
-
D.
3.73dm3
Correct Answer: Option B
Explanation
C2H4(g) + 3O2(g) \(\to\) 2CO2(g) + 2H2O(l)
1 mole of ethene required 3 moles of O2
28g of ethene required 3 x 22.4dm3 of O2
14g will require \(\frac{14 \times 3 \times 22.4dm^3}{28}\)
= 33.6dm3
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