An ice cube with a mass of 48.6 g at 0.0 ∘C is added to a glass containing 391 g of water at 45.0 ∘C . Determine the final temperature of the system at equilibrium. The specific heat capacity of water, s , is 4.184 J/g⋅∘C , and the standard enthalpy of fusion, Δ∘fus , of water is 6.01×103 J/mol . Assume that no energy is transferred to or from the surroundings.