Using the steam tables, determine the enthalpy change for 1 lb water for each of the following cases. (a) Heating liquid water from 40°F to 240°F at 30 psia. (Note that the effect of total pressure on the enthalpy of liquid water can be neglected.) (b) Heating liquid water from 40°F to 240°F and vaporizing at 240°F and 24.97 psia. (c) Cooling and condensing a saturated vapor at 212°F and 1 atm abs to a liquid at 60°F. (d) Condensing a saturated vapor at 212°F and 1 atm abs.

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A: The increase in the water content of the moist air is m.water = 0.246 kg/s.

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A:

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Q: 13–38 A rigid tank that contains 1 kg of N, at 25°C and 300 kPa is connected to another rigid tank…

A:

Q: he quality of a two-phase mixture of: (a) water at 400°F and a specific volume of 0.55 ft/lbm; (b) R…

A: we will use the standard properties table Temp ( F) =400 Satiuration Pressure =247.26 vf =0.01864…

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Q: You want to prepare a mixture with 5.00 kg of some liquid at 10.0°C added to 1.00 kg of the same…

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A: The initial mass of liquid water, initial mass of steam, initial pressure, final temperature,

Q: ure at 21

A: given:

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Q: 2. Determine the specific enthalpy for 80 kg of H₂O occupying a volume of 2.5 m³ at 320°C.

A: Given:mass of water = m = 80 kgvolume of water = Temperature of water = Find:The enthalpy of water.

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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.