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The value of DeltaH for cooling 2 moles ...

The value of `DeltaH` for cooling 2 moles of an ideal monoatomic gas from `125^@C` to `25^@C` at constant pressure will be [given `C_P=5/2R` ] _____

A

`-250`R

B

`-500` R

C

500 R

D

`+250` R

Text Solution

Verified by Experts

The correct Answer is:
B
`T_i=125^@C`=398 K
`T_f=25^@C`=298 K
`DeltaH=nC_p(T_f-T_i)`
`DeltaH=2xx5/2R(298-398)`
`DeltaH` =-500 R
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