1. The problem statement, all variables and given/known data Heated iron with mass of 55.0 g was added to 100 mL of water at 20 degree Celsius. Assuming no energy transfer to the surroundings and that the final temperature of the system is 42.7 degrees C, calculate initial temperature of the iron. Mass of Iron = 55.0 g mass of Water = 100g initial Temp of Water = 20 degrees C Final temp of Water/Fe = 42.7 degrees Want: initial temp of Fe Given Cs of Fe = 0.451 J/gC Cs of Water = 4.184 J/gC 2. Relevant equations heat of Iron = -heat of water (q=-q) mCT = mCT 3. The attempt at a solution mCT of Fe = -mCT of water plug in: X= initial temp of Fe 55 * 0.451*(42.7-X) = 100*4.184*(42.7-20) When i solve for X , i get a large negative number = -9497.68 which is clearly not the final temperature! Was wondering where i went wrong!