Which of the following Statement are Correct ?
(1) `DeltaH=DeltaU+Deltan_(g)RT` for chemical and phase change
(2) `DeltaH=DeltaU"for the reation"`
(3) `C(s)+O_(2)(g)toCO_(2)(g)`
(4) Heat of formation for `C_(6)H_(6)`can be calculated by bond enthalpies only
A. 2,3
B. 1,4
C. 1,2,3
D. 1,3
