Given:
m = 817 g
C = 4.184 J/g.oC
Ti = 8 oC
Tf = 22 oC
use:
Q = m*C*(Tf-Ti)
Q = 817.0*4.184*(22.0-8.0)
Q = 47857 J
Q = 47.9 KJ
Answer: 47.9 KJ
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