You place 100 grams of ice, with a temperature of −10∘c, in a styrofoam cup. then you add an unknown mass of water, with a temperature of +10∘c, and allow the system to come to thermal equilibrium. for the calculations below, use the following approximations. the specific heat of solid water is 2 joules / gram, and the specific heat of liquid water is 4 joules / gram. the latent heat of fusion of water is 300 joules / gram. assume no heat is exchanged with the surroundings. express your answers in grams, using two significant digits.

if the final temperature of the system is -5∘c , how much water was added? grams