A pressurecooker (a kitchen appliance) is a pot on which the top seals tightly,

Question

A pressurecooker (a kitchen appliance) is a pot on which the top seals tightly, allowing pressure to build up inside. You put water in the pot and heat it to boiling. At the higher pressure, water boils at a higher temperature, and this allows food to cook at a faster rate. Most pres­sure cookers have a setting of 15 psi, which meat that the pressure in the pot is 15 psi above atmosphere pressure ( 1 atm = 14.70 psi). Use the Clausius-Chtpevron equation to calculate the temperature at which water boils in the pressure cooker. 64 Vapor pressures of NH3(l) at several temperatures are given in the table below. Use this information to calculate

Explanation / Answer

Clausius-Clapeyron Equation:
ln(P/P) = –(H_vap/R)(1/T – 1/T) ; H_vap = 40700 J/mol
here P2 = 15 psi = 1.02 atm
At the boiling point of water (T = 373 K), P = 1.0 atm

ln(1.02/1.0) = –(40700/8.314)(1/T – 1/373)

0.02 = –(4895 K)(1/T – 2.68*10^-3)

0.02 = -4895/T2+ 13.12

4895/T2 = 13.1

T2= 373.66 K

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