The instruction booklet for your pressure cooker indicates that its highest sett

Question

The instruction booklet for your pressure cooker indicates that its highest setting is 11.4psi . You know that standard atmospheric pressure is 14.7 psi, so the booklet must mean 11.4psi above atmospheric pressure. At what temperature in degrees Celsius will your food cook in this pressure cooker set on "high"? Express your answer numerically in degrees Celsius. The instruction booklet for your pressure cooker indicates that its highest setting is 11.4psi . You know that standard atmospheric pressure is 14.7 psi, so the booklet must mean 11.4psi above atmospheric pressure. At what temperature in degrees Celsius will your food cook in this pressure cooker set on "high"? Express your answer numerically in degrees Celsius.

Explanation / Answer

Clausius-Claperyon equation:

ln(P2/P1) = (-DHvap/R) x (1/T2 - 1/T1)


P1 = 14.7 psi, P2 = 14.7 + 11.4 = 26.1 psi

T1 = 100.0 deg C = 373.15 K, T2 = ?

Heat of vaporization of water = DHvap = 40.67 kJ/mol = 40670 J/mol

R = 8.314 J/mol.K


Substituting values into equation:

ln(26.1/14.7) = (-40670/8.314) x (1/T2 - 1/373.15)

Temperature T2 = 390.24 K = 117 deg C

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