1. A substance, X, has the following properties: AHvap AHfus bp mp C(s) Cs(1) Cs(g) 20. kJ/mol 5.0 kJ/mol 75C -15C 3.0 J/g. C 2.5 J/g. C 1.0 J/g. C a) Sketch a heating curve for substance X on the plot below starting at -50.C. b) Given the properties above and your heating curve below for substance X, calculate the energy that must be removed to convert 250. g of substance X from a gas at 100.C to a solid at -50.C. Assume X has a molar mass of 75.0 g/mol. Show your work in the space at right