Answer in General Chemistry for Megan Wakley #149869
March 18th, 2023
Two processes occur here that require energy. (i) Phase change(melting), and (ii) temperature change;
I. Q during Phase change
Q1=mLf
“=dfrac{175.0}{1000}Kgx334J/Kg”
= 58.45J
II. Q for temperature change
Q2=mC“Delta”T
“=175.0gxdfrac{4.18J}{g^oC} x 45.0^oC”
= 32,917.5J
Add up for total energy
QT=Q1 + Q2
= 58.45J + 32,917.5J
= 32,975.98J
= 32.98kJ