How much heat is needed to change 5.42 grams of solid gold to liquid gold at its melting point of 1,063°c? the latent heat of fusion of gold is 66.6 j/g. a –12.3 joules b 12.3 joules c –361 joules d 361 joules

We can easily calculate for the heat Q needed to change 5.42 grams of solid gold to liquid gold at its melting point using the equation     
     Q = mLf, 
where m is the mass of solid gold and Lf is the latent heat of fusion of gold.

Substituting the values to the equation we now have     
     Q = 5.42 g (66.6 J/g) = 360.972 J

Therefore we need 361 Joules to melt 5.42 grams of solid gold.