1.

1.25 of sample of C Cl_2F_2 was cooled at a constant pressure of 1 atm. From 320 K to 293 K. During cooling, the volume decreased from 274 to 248 mL.Delta H and DeltaU" for " CCl_2 F_2 " is " (C_p = 80. 7 J mol^(-1) K^(-1)) :

Answer»

`-22.5 J,- 19.88J`
`19.88 J, - 25.51 J`
`108.26 J, -4659 J`
`- 26.7 J, 89.5 J`.

ANSWER :A


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