How much heat needs to be spent in order to melt 4 kg of aluminum taken at a temperature of 520C °.

The melting point of aluminum is 660C. Therefore, it is necessary to spend Q1 heat on heating it to the melting temperature and Q2 heat on melting itself. Total Q = Q1 + Q2 = CaMa (Tm-To) + kMa, where Ca is the specific heat of aluminum, Ma is the mass of aluminum, Tm is the melting point of aluminum, To is the initial temperature of aluminum, k is the specific heat of fusion of aluminum (usually denoted by the letter “lambda”). Q = 880 x 4 x (660 – 520) + 380,000 x 4 = 492800 + 1520000 = 2012800 J or approximately 2 MJ.