What volume of methane at STP would be required to convert a 2.1 kg block of ice at −20 ∘C to water at 20 ∘C, assuming that no heat is lost? The heat of fusion for ice is 6.01 kJmol−1 . The heat capacity of ice is 2.108 Jg−1∘C−1, the specific heat capacity of water is 4.184 Jg−1∘C−1 and the heat of combustion for methane is 891 kJ.