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

1792 J.

Explanation:

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.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

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