1.

What is the changein internalenergywhen a gas constantsfrom377 ml to 177 mlundera constantpressureof 1520 torr , while at thesame time being cooledby removing124Jheat ?[Take :(1 L atm )n= 100 J]

Answer»

`-24 J`
` -84J`
`-164 J`
`-248 J`

Solution :`C_(4)H_(4)+HCl to C_(2) H_(5)Cl`
`Deltan_(g) = - 1`
HClislimitingreagent `rArr DeltaU= DeltaH - Deltan_(g)RT`
` = - 185 +(1 xx 8.314 xx 10 ^(-3) xx 300) = - 69.8 kJ`
Fortwo MOLE of HCl `= - 69.8 xx2= -139.6 kJ`


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