# Problem: A block of copper of unknown mass has an initial temperature of 65.1 oC. The copper is immersed in a beaker containing 95.1 g of water at 22.8 oC. When the two substances reach thermal equilibrium, the final temperature is 24.6 oC. What is the mass of the copper block? Assume that Cs, H2O = 4.18 J/(g ) and Cs, Cu = 0.385 J/(g ).

###### FREE Expert Solution

Recall that heat can be calculated using the following equation:

$\overline{){\mathbf{q}}{\mathbf{=}}{\mathbf{mc}}{\mathbf{∆}}{\mathbf{T}}}$

+qabsorbs heat
–qloses heat

heat lost by the Copper, Cu block = heat absorbed by water

– qCu = + qwater

At thermal equilibrium:

▪ final temperature of copper = final temperature of water = final temperature of system

###### Problem Details

A block of copper of unknown mass has an initial temperature of 65.1 oC. The copper is immersed in a beaker containing 95.1 g of water at 22.8 oC. When the two substances reach thermal equilibrium, the final temperature is 24.6 oC. What is the mass of the copper block? Assume that Cs, H2O = 4.18 J/(g ) and Cs, Cu = 0.385 J/(g ).