115 G of Dry Ice (Solid CO₂)is Dropped into a Beaker

Multiple Choice

115 g of dry ice (solid CO₂) is dropped into a beaker containing 550 g of 78°C water.The dry ice converts directly to gas,leaving the solution.When the dry ice is gone,the final temperature of the water is 47°C.What is the heat of vaporization of solid CO₂? (c_water = 1.00 cal/g⋅°C)
​

A) 166 cal/g
B) 139 cal/g
C) 103 cal/g
D) 148 cal/g
E) ​157 cal/g