A block of copper of unknown mass has an initial temperature of 64.7 ∘c . the copper is immersed in a beaker containing 95.7 g of water at 23.0 ∘c . when the two substances reach thermal equilibrium, the final temperature is 24.0 ∘c . what is the mass of the copper block? assume that cs,h2o=4.18j/(g⋅∘c) and cs,cu=0.385j/(g⋅∘c)