Question

You have collected exactly 2800 aluminum cans for recycling, each with a mass of 13.6 g. How much energy is needed to melt them if their initial temperature is 26.2◦C? Assume the specific heat, the latent heat and the melting point of aluminum are 899 J/kg ·◦ C,
3.97 × 105 J/kg and 660.4 ◦C, respectively. Answer in units of J

Answer 1

c=899 J/kg •◦ C, r= 3.97 × 105 J/kg
m=2800•0.0136= 38.08 kg
E = Q=cm(660.4-26.2) + r m = …