Answer:
80.0°C will be the final temperature inside the calorimeter.
Step-by-step explanation:
Heat lost by the pace of jewelry will be equal to heat gained by the another piece of the jewelry

Mass of piece-1=

Specific heat capacity of copper=
= 0.387 J/g.K
Initial temperature of the iron =

Final temperature =
=T

Mass of piece-2=

Specific heat capacity of copper =
= 0.387 J/g.K
Initial temperature of the water =

Final temperature of water =
=T

(conservation of energy)

On substituting all values:


80.0°C will be the final temperature inside the calorimeter.