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a) What is the final temperature of the system after is has come to thermal equilibrium ?

b) In terms of mass, how much of the ice has melted?

c) Now lets drop a second 50gm cube of ice into the system. What is the final temperature of the system after it has come to thermal equilibrium for this second time?

d) What is the total mass of ice (including the first cube) melted during this entire process?

Specific heat of water= 4186; Ice= 2090 (got these from book)

so for A, i calculated about 19.5C which was wrong..here is what i did

Q= (.2*4186*(0-25))-(.05*2090)-(.05*4186*(25-0))

Temp change= Q/((.2+.05)*4186)