218k views
3 votes
One piece of copper jewelry at 101°C has twice the mass of another piece, which is at 38.0°C. Both pieces are placed inside a calorimeter of negligible heat capacity. What is the final temperature inside the calorimeter (c of copper=0.387 j/g.k)?

1 Answer

6 votes

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


-Q_1=Q_2

Mass of piece-1=
m_1=2m

Specific heat capacity of copper=
c = 0.387 J/g.K

Initial temperature of the iron =
T_1=101^oC

Final temperature =
T_2=T


Q_1=m_1c_1* (T-T_1)

Mass of piece-2=
m_2=m

Specific heat capacity of copper =
c = 0.387 J/g.K

Initial temperature of the water =
T_3=38.0^oC

Final temperature of water =
T_2=T


Q_2=m_2c_2* (T-T_3)


-Q_1=Q_2 (conservation of energy)


-(m_1c_1* (T-T_1))=m_2c_2* (T-T_3)

On substituting all values:


-(2mc* (T-101^oC))=mc* (T-38.0^oC)


T= 80.0^oC

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

User Tom Willis
by
7.3k points