SolutionHard
Question
Molal depression constant for Pb is 8.5°C kg/mol. How many grams of Sn must be dissolved in 425 g of Pb to produce an alloy with melting point of 322°C? The melting point of pure Pb is 327°C. (Sn = 120)
Options
A.30.0 g
B.15.0 g
C.86.7 g
D.41.3 g
Solution
$\Delta T_{f} = K_{f}.m \Rightarrow 5 = 8.5 \times \frac{w/120}{425/1000} \Rightarrow w = 30\text{ gm}$
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