Calorimetry help??

Question

A 15.0 g sample of nickel metal is heated to 100.0'C and dropped into 55.0 g of water, initially at 23.0'C. Assuming that all the heat lost by the nickel is absorbed by the water, calculate the final temperature of the nickel and water (nickel (specific heat) is 0.444 J/g 'C)

Answer 1

Use the equation:

m c (T2-T1) = - m c (T2-T1)

(15.0)(0.444)(T2-100) = - (55.0)(4.184) (T2-23.0)

Solve for T2 (the final temperature)