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01/10/2020 5:07 pm
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0.450 g of urea (mol.wt.60) in 22.5 g of water show 0.170°C of elevation in boiling point. The molal elevation constant of water is:
(a) 0.051°C
(b) 0.51°C
(c) 5.1°C
(d) 0.83°C
1 Answer
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01/10/2020 5:21 pm
(b) 0.51°C
Explanation:
ΔT = Kb w/m
0.170 = Kb 0.450/60 x 1000/22.5
Kb = (0.170 x 60 x 22.5)/1000 x 0.450
= 0.51°C