A gas mixture consists of methane (CH4) and carbon dioxide (CO2). The mass fraction of CH4 is 0.84. The total mass is 10 kg. Determine the gas constant of the mixture in kJ/kg-K. Use four decimal places for your final answer

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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.