Asubstance, x, has the following properties. (size of mass is 250. g.) specific heat capacities δhvap 20. kj/mol c(s) 3.0 j/g·°c δhfus 5.0 kj/mol c(l) 2.5 j/g·°c bp 75°c c(g) 1.0 j/g·°c mp −15°c calculate the energy that must be removed to convert substance x from a gas at 107°c to a solid -54.3°c. assume x has a molar mass of 75.0 g/mol.

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in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.