Q = 50.9 KJ = 50900 J
m = 456 g
Ti = 18.0 oC
Specific heat capacity of water, C = 4.184 J/g.oC
Now use:
Q = m*C*(Tf - Ti)
50900 J = 456 g * 4.184 J/g.oC * (Tf - 18.0) oC
Tf - 18.0 = 26.7
Tf = 44.7 oC
Answer: 44.7 oC
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