How many kilojoules are required to melt 5 lbs of gold if its initial temperature is 1000 K?
You must provide much of this informaton from your text/notes/other sources.
Convert 5 lbs Au to grams. There are 453.6 g in 1 lb.
Look up the melting point of Au, in degrees C and convert that to kelvins. That is done with K = 273 + C.
Look up the specific heat Au.
Look up the heat fusion of Au.
q1 = heat needed to raise T from 1000 K to the melting point of Au.
q1 = mass Au x specific heat Au x (Tmelting point - Tinitial).
q2 = heat needed to convert solid Au at the melting point to liquid Au at the melting point.
q2 = mass Au x heat fusion.
Total q = q1 + q2.