a local barista serves coffee at 85C you add ice to the coffee to cool it to 55C assume that an ice cube is 24g and -18.5C how many ice would you need to add to your 355 ml cup of coffee to bring it to 55C? the specific heat of ice is 2.05 J/g C the specific heat of water is 4.184 J/g and the specific heat of fusion of water is 334 J/g remember that an ice cube will need to be warmed to 0C will melt and then newly melted water will be warmed to 55C