Answer: 69.92 Celsius
Explanation:
Enthalpy change = mass of water * specific heat * change in temperature
400g water * 4.18 J/g*celsius * 1.5K = 2.508kJ
2508 J/(138.3g*0.38 J/g*celsius) = 47.72 K
So the copper temperature was lowered by 47.72K/C when placed in water, so 22.2+47.72 = 69.92 Celsius
Hope this helps(and is correct)!
