The value of ∆H for cooling 2 mole. of an ideal monoatomic gas from 225°C to 125°C at constant presser will be ( given Cp=5/2 R
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The enthalpy is calculated as퐻=휗퐶푃푇And so ∆퐻=휗퐶푃∆푇because the pressure is constantand the gas is ideal.∆푯=흑푪푷∆푻=2∗52∗8.31∗(225−125)=ퟒퟏퟓퟓ
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