Question

How much energy would a jeweler need to melt 4.4 g of copper to fix a broken necklace if the copper starts out at 25°C and melts at 1083°C

Answer 1

Answer:

1792 J.

Explanation:

• To calculate the energy would a jeweler need, we use the relation:

The amount of heat released from Cu = Q = m.c.ΔT.

where, m is the mass of Cu (m = 4.4 g).

c is the specific heat capacity of Cu = 0.385 J/g°C.

ΔT is the temperature difference = (final T - initial T = 1083°C - 25°C = 1058°C).

∴ The amount of heat released from Cu = Q = m.c.ΔT = (4.4 g)(0.385 J/g°C)(1058°C) = 1792 J.