1.

What amount of heat is needed to raise the temperature of 2xx 10^(-2) kg of nitrogen at room temperature to raise itstemperature by 45^(@)C at constant pressure ? (Given molecular mass =28 and R=8.3" J mol"^(-1)K^(-1),C_(p)=7//2 R):

Answer»

`9.33 CAL`
`93.3 J`
`933.4 J`
`933.3 cal`

SOLUTION :Number of moles `n=(m)/(M)=(20)/(28)=0.174`
`C_(p) =(7)/(2) R=(7)/(2) xx8.3 J" mole"^(-1) K^(-1)`
`Delta Q =n C_(p) XX Delta T`
`=0.714xx(7)/(2)xx8.3 xx45 J`
`=933.4 J`.
`therefore` Correct CHOICE is (c ).


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