Chemistry Practice Problems Clausius-Clapeyron Equation Practice Problems Solution: If ΔHvap for water is 40.7 kJ/mole, calculate Pvap...

Solution: If ΔHvap for water is 40.7 kJ/mole, calculate Pvap of water at 37°C.(a) 6.90 torr(b) 12.4 torr(c) 18.7 torr(d) 25.4 torr(e) 52.6 torr

Problem

If ΔHvap for water is 40.7 kJ/mole, calculate Pvap of water at 37°C.

(a) 6.90 torr

(b) 12.4 torr

(c) 18.7 torr

(d) 25.4 torr

(e) 52.6 torr

Solution

We’re being asked to determine the Pvap of water at 37°C. We’re given the heat of vaporization of water ΔHvap = 40.7 kJ/mol. We can use the Clausius-Clapeyron Equation to solve for the Pvap of water.


ln P2P1=-HvapR[1T2-1T1]


where:

P1 = vapor pressure at T1

P2 = vapor pressure at T2

ΔHvap = heat of vaporization (in J/mol)

R = gas constant (8.314 J/mol•K)

T1 and T2 = temperature (in K).


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