Marc has a red, itchy rash on his hands and feet. The skin on his hands and feet is blistered and dry. Which disease did Marc most likely contract?

There would have to be three nitrogen atoms in the products. The law of conservation of matter states that the amount of substance before a reaction occurs  should be the same as the amount of substance after the reaction.

Explanation: This is the EXACT sample answer from the test, just reword it if you want. ^