*Messed up title, should have been find initial temp of copper* 1. The problem statement, all variables and given/known data 8.00 g of aluminum at 200 °C and 18.0 g of copper are dropped into 50.0 cm3 of ethyl alcohol at 15 °C. The temperature quickly comes to 26.0 °C. What was the initial temperature of the copper? Density of ethyl alcohol = .789 g/ml mass of ethyl alcohol = 39.45 g, .03495 kg mass of copper = .018 kg mass of aluminum = .008 kg Tf = 299 K Ti, alum = 473 K Ti, eth = 288 K c for aluminum = 900 J/kg*k c for ethyl alcohol = 2400 J/kg*k c for copper = 385 J/kg*k 2. Relevant equations Qa + Qc + Qe = macaΔT + meceΔT + mcccΔT = 0 3. The attempt at a solution Qa + Qc + Qe = macaΔT + meceΔT + mcccΔT = 0 =(.008)(900)(-174) + (.03945)(2400)(11) + (.018)(385)(299-Ti) = 0 Ti = 268.51 K or -4.5 °C That's what I did, but it says not quite and tells to check for rounding errors. However, I didn't round anything until the very end, so I'm not quite sure where I went wrong. I also tried -4.494 but that was wrong too.