Answer) 1) 60.1 torr
2) 120.2 torr
Explanation:
Vapor pressure of solution increases as the temperature increases.
The ratio of vapor pressure of solution to vapor pressure of solvent must remain same ideally.
Therefore,
P(Solution,25°C):P(water,25°C) =P(Solution,45°C):P(water,45°C)
19.9 torr/ 23.8 torr =P(Solution,45°C)/71.9 torr
P(Solution,45°C)=[(19.9 × 71.9)/23.8] torr
P(Solution,45°C)= 60.1 torr
Vapor pressure formula:
π = i MRT
Here, π is vapor pressure, i is the ratio of number of moles of particles in solution to the number of moles of solute in solution, M is the concentration/molarity, R is gas constant and T is the temperature.
R is a constant, T= 45°C therefore constant , M is concentration is constant for both glucose and NaCl at 45°C because number of moles are equivalent.
Hence π is only directly proportional to i.
i for glucose is 1 because it dissolves im water but doesn't dissociate.
i for NaCl is 2 because 1 mol NaCl dissociate into 1 mol Na+ and 1 mol Cl-.
Ratio of NaCl to gluose vapor pressure .
π(NaCl,45°C)/π(glucose,45°C) = iNaCl/iglucose
π(NaCl,45°C)/(60.1 torr) = 2/1
π(NaCl,45°C)= 2× 60.1 torr = 120.2 torr
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