Under what condition will the change in enthalpy equal the change in internal energy for a given chemical system?

Explanation:

The change in enthalpy of a system when a chemical reaction occurs is equal to to change in internal energy of the system added to the change in the product of Volume times pressure of the system.

Now, change in enthalpy equal the change in internal energy for a given chemical system when the product of volume time pressure is Zero. That neither the does any work nor any work in done on the system.

B. to promote happiness and peace during the Christmas season

Explanation:

After the Japanese attack on Pearl Harbor, the British Prime Minister Winston Churchill flew to Washington, D.C. in order to meet President Franklin Roosevelt and discuss how the two countries (Britain and the United States) could coordinate strategy in the wake of Japan’s attack on Pearl Harbor. Since he was away from Britain, Churchill broadcast to the world from the White House and the purpose of his speech was to dedicate the night and holiday to children. Churchill wanted the people to celebrate the night without the cares of war, especially the children (“Let the children have their night of fun and laughter”). The rest of the options are incorrect because they are a misunderstanding of the text (A, C), or an action that has already happened, that is, the union of Britain and the United States (D).