1.

Ethyl choride (C_(2)H_(4)(g)Cl), is prepared byt reactionof ethylen with hydrogen chloride :C_(2)H_(4)(g) + HCl to C_(2)H_(5)Cl(g)Whatis the valueof DeltaU (in kJ), if 70 g ethlene and 73 gof HClare allowed to react at 300 K.

Answer»

`-69.8`
`-180.75`
`-174.5`
`-139.6`

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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