Answer : The amount of heat required is, 639.3 KJ
Solution :
The conversions involved in this process are :
Now we have to calculate the enthalpy change.
where,
= enthalpy change or heat required = ?
m = mass of Cr = 126.3 g
= specific heat of solid Cr =
= specific heat of liquid Cr =
n = number of moles of Cr =
= enthalpy change for fusion = 20.5 KJ/mole = 20500 J/mole
Now put all the given values in the above expression, we get
(1 KJ = 1000 J)
Therefore, the amount of heat required is, 639.3 KJ