Short Answer Type
Long Answer TypeShort Answer TypeCalculate the maximum work obtained when 0.75 mol of an ideal gas expands isothermally and reversibly at 27°C from a volume of 15L to 25L.
If water vapour is assumed to be a perfect gas,
molar enthalpy change for vapourisation of 1 mol of water at 1bar and 100°C is 41kJ mol–1. Calculate the internal energy change, when
(i) 1 mol of water is vaporised at 1 bar pressure and 100°C.
What informations are provided by the First law of Thermodynamics?
From the first law, we learn that:
(i) Different forms of energy are interconvertible i.e. one form of energy can be converted into another.
(ii) Whenever one form of energy disappears, an equivalent amount of energy in another form appears.
(iii) Total energy of the universe i.e. energy of the system and surroundings taken together remains constant.
Long Answer TypeDerive mathematical form of First law of Thermodynamics.
Or
Derive the relationship between heat, internal energy and work.
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