Juan measured the temperature of salt water. he then added 273 to the measured value. which conversion is juan most likely doing? degrees celsius to degrees fahrenheit degrees celsius to kelvins kelvins to degrees celsius degrees fahrenheit to degrees celsius

An insulated thermos contains 148 g of water at 72.7 ˚c. you put in a 11.7 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?