Question

Ethyl choride `(C_(2)H_(4)(g)Cl)`, is prepared byt reaction of ethylen with hydrogen chloride :
`C_(2)H_(4)(g) + HCl to C_(2)H_(5)Cl(g)`
What is the value of `DeltaU` (in kJ), if 70 g ethlene and 73 g of HCl are allowed to react at 300 K.
A. `-69.8`
B. `-180.75`
C. `-174.5`
D. `-139.6`

Answer 1

Correct Answer - D
`C_(4)H_(4)+HCl to C_(2) H_(5)Cl`
`Deltan_(g) = - 1`
HCl is limiting reagent `rArr DeltaU= DeltaH - Deltan_(g)RT`
` = - 185 +(1 xx 8.314 xx 10 ^(-3) xx 300) = - 69.8 kJ`
For two mole of HCl `= - 69.8 xx2 = - 139.6 kJ`