A closed frictionless piston-cylinder device contains 0.365 kmol of an ideal gas known as Minesium (MW=38.0 g/mol, C, = 4R). The device undergoes a three-state, three process cycle. Initially the gas is at 205 °C and 350.0 kPa (State 1). It is isothermally compressed to a pressure of 550.0 kPa (State 2). From State 2, the pressure in the piston-cylinder device is reduced to 350.0 kPa via an isochoric process (State 3). Finally, the gas is expanded isobarically to the initial State 1 conditions. What is the work from State 1 to State 2, W12? kJ What is the work from State 2 to State 3, W23? kJ What is the work from State 3 to State 1, W31? kJ What is the total heat for this three step cycle, Qtot? kJ

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.