Answer;3.67061 kg of gold must be solidified to release 235 kJ of energy.
Explanation:
Molar heat of gold = 12.550 kJ/mol
1 mole of gold releases = 12.550 kJ/mol
Or we can rewrite it as ,1 kJ of energy is given by[tex][\frac{1}{12.550} mol[/tex]
Then 235 kJ of energy will be released by:
[tex]\frac{1}{12.550 kJ}\times 235 kJ=18.72 moles[/tex] of gold
Mass of gold in 18.72 moles = 18.72 mole × 196.08 g/mol =3,670.61 g =3.67061 kg
1 kg = 1000 g
3.67061 kg of gold must be solidified to release 235 kJ of energy.