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Answer on Physical Chemistry Question for Billy

Question #7103
Sandra has 500g of water boiling at 99 celsius (C), her recipe calls for water to be at 78C, ice is at 0C, how much ice must she add to cool down the water?
Expert's answer
C1 for water =4200 J/kg*K
C2 for ice
=2100

m1=500
t1=99
t2=0

L=335
kJ/kg

m1*c1*(t-t1)=m2*L+m2*c1*(t-t2)

m2=66.5

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