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WAEC Chemistry 2016 Paper
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© africaexams.com
Question : 7
Total: 50
The mass of potassium hydroxide required to make 300.ocm
3
of 0.4 moldm
-3
solution is {KOH = 56.0}
26.88g
13.44g
6.72g
3.36g
Validate
Solution:
300cm
3
of 0.4moldm
3
1000cm
3
contains 0.4mole
300cm
3
will contain
300
×
0.4
1000
= 0.12mole
Number of moles =
Mass
Molecular mass
Mass = number of moles x m.mass
= 0.12 x 56 = 6.72g
© africaexams.com
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