If 50 cm 3 of a saturated solution of KNO 3 at 40 o C
CHEMISTRY
WAEC 2022
If 50 cm3 of a saturated solution of KNO3 at 40oC contained 5:05 g of the salt, its solubility at the same temperature would be [KNO3 = 101]
- A. 1.0 mol dm?3
- B. 1.5 mol dm?3
- C. 2.0 mol dm?3
- D. 5.0 mol dm?3
Correct Answer: A. 1.0 mol dm?3
Explanation
V= 50cm3 Mass= 5.05g Relative molecular mass of KNO3 = (39+14+(3*16)) = 101 Convert 50cm3 to dm3 which is 1000cm
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