A P. answered 03/13/20
Chemical engineer with 15+ years of chemistry teaching experience
First law of thermodynamics - energy is not created or destroyed, but transferred. We can interpret this as:
qin + qout = 0, or qin = -qout, or qwater = -qmetal
q=m*cp*(Tf-Ti). You have the mass and the heat capacity of water (4.184J/gC). From there, you should be able to figure this out.