The vapour pressure of 0.01 molal solution of weak base BOH in water at 20°C is 17.536 mm

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Problem

The vapour pressure of 0.01 molal solution of weak base BOH in water at 20°C is 17.536 mm. Calculate

K_b

for base. Aqueous tension at 20°C is 17.540 mm. Assume molality and molarity same.