The specific heat capacity of nickel is 0.440 J/(gK). If you have a nickel ball that starts at 100.0 °C and gets dropped into a calorimeter containing 50.0 g of water (yes, you should know the specific heat of water), which goes from 20.0 °C to 23.5 °C. What is the mass of the nickel ball?

Answer 1

[mass Ni x specific heat Ni x (Tfinal-Tinitial)] + [mass H2O x specific heat H2O x (Tfinal - Tinitial)] = 0
Substitute and solve for mass Ni which is the only unknown in the equation.
Post your work if you get stuck.

Answer 2

i came up with 733.74? Not sure if thats correct.