This is the question... What is the maximum mass of lead you could melt with 1000 J of heat, starting from 20C? I know that for lead Tm = 328 degrees C Lf (j/k) = 0.25 x 10 ^5 Tb = 1750 degrees C Lv = 8.58 x 10^5 but i'm not really sure what i need to use. Q = Mc delta T but how can you figure this without having an ending temperature? I'm confused. Anyone have an idea?