A sealed container of 1.9 m3 volume contains 177 kg of water in the saturated liquid-vapour state at 275 °C. Determine the total internal energy of the water in the container using the appropriate property tables. You may find it helpful to calculate the quality of the water as a first step, before determining the final answer. Give your calculated value of the total internal energy in MJ to one decimal place.

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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.