A 12-Inch Diameter Ball of Pure Cobalt Metal at 225°C

A 12-inch diameter ball of pure cobalt metal at 225°C was placed in 10.0 gal. of water at 15.0°C. What is the final temperature of the water? Assume no heat is lost to the surroundings. (sp ht for cobalt is 0.421 J/g °C, density of cobalt = 8.862 g/cm3, 1 gal. = 3.785 L, 1 in = 2.54 cm, V(sphere) = 4/3 πr3)

A) 169°C
B) 120°C
C) 69.3°C
D) 22.5°C
E) 45.6°C