Answer: I think the answer is 3.) Krypton or Argon.
Explanation:
Answer:
2Hgo —>2Hg + O2
Q=mc*temperature change
400=5.6/1000*c*(87-23)
c=1160.07J/kg/k
An exothermic reaction is a chemical reaction that releases energy by light or heat. Endothermic reaction is a chemical reaction that absorbs energy or heat from its surroundings
