= 1.778 kJ
Considering the following;
Molar mass of lead = 207
Heat of fusion: 4.77 kJ x mol^-1
Specific heat: 0.134 J x g^-1xC^-1
Heat required to raise its temp from 297 k to (328+273)k
= 23 × 0.134 × (601-297)
=936 .928 Joules
Heat required to change its state from solid to liquid
= (23/207) moles ×4.77 kJ/mol
= 0.53 kJ or 530 Joules
Heat required to raise the temp from 601 k to 702 k
=23 × 0.134 ×101
= 311.282 Joules
Therefore; 311.282 + 530 + 936.928 = 1778.21 Joules
Thus; = 1.778 kJ
