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WAEC Chemistry 2016 Paper
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© africaexams.com
Question : 46
Total: 50
Consider the following reaction equation
C
2
H
4(g)
+ 3O
2(g)
to
2CO
2(g)
+ 2H
2
O
(l)
.
The volume of oxygen at s.t.p that will be required to burn 14g of ethene is
[C
2
H
4
= 28; Molar volume of gas at s.t.p = 22.4dm
3
64.2dm
3
33.6dm
3
11.2dm
3
3.73dm
3
Validate
Solution:
C
2
H
4(g)
+ 3O
2(g)
to
2CO
2(g)
+ 2H
2
O
(l)
1 mole of ethene required 3 moles of O
2
28g of ethene required 3 x 22.4dm
3
of O
2
14g will require
14
×
3
×
22.4
d
m
3
28
= 33.6dm
3
© africaexams.com
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