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WAEC Chemistry 2016 Paper
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© africaexams.com
Question : 31
Total: 50
On evaporation to dryness, 350
3
of saturated solution of salt Z gave 55.5g of salt. What is the solubility of the salt? [Z = 101]
1.57 moldm
-3
3.14 moldm
-3
6.28 moldm
-3
12.56 moldm
-3
Validate
Solution:
Saturated solution = 350
3
mass of salt Z in saturated solution = 55.5g
Number of moles of salt =
55.5
101
= 0.55mole
350
3
of solution contains 0.55mole
1000cm
3
will contain
1000
×
0.55
350
= 1.57mol/dm
3
© africaexams.com
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