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WAEC Chemistry 2014 Paper
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© africaexams.com
Question : 16
Total: 45
If 0.20 mol dm
-3
NaOH
(aq)
was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH
(aq)
used. (Na = 23.0,O = 16:0; H = 1.00)
600cm-
3
625cm
3
1000
3
1600 cm
3
Validate
Solution:
Mole = 5/40 = 0.125 mole
:. 0.2 mole NaOH dissolved in 1000 cm
3
0.125 mole NaOH dissolved in xcm
3
xcm
3
=
0.215
x
1000
0.2
= 625cm
3
© africaexams.com
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