Which of the Following Statements Is/are CORRECT?
1)If a Reaction $\Delta$

Multiple Choice

Which of the following statements is/are CORRECT?
1) If a reaction occurs at constant pressure,q = $\Delta$ H.
2) The change in energy for a system is defined as the sum of the energies transferred as heat and work (i.e., $\Delta$ U = q + w) .
3) If a reaction occurs at constant volume,q = w

A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2,and 3