Answer
26,450 J, 6320 cal lost
Work Step by Step
$\Delta T = 2.1^{o}C - 86.4^{o}C = -84.3^{o}C$
Heat = mass x $\Delta T$ x SH
Heat (J)= 75g x $-84.3^{o}C$ x 4.184 J / g $^{o}C$
= 26,453.34 J
Heat (cal)= 125g x $63^{o}C$ x .108 cal / g $^{o}C$
= 6322.5 cal