Questions and Answers
The molecular weight of water is approximately 18.0.
True
The gas constant for water vapour is 461.53 m3 Pa / kg mol K.
False
Below temperatures of 66°C, the saturated or superheated vapour follows non-ideal gas laws.
False
The specific heat of water vapour is approximately 2.0 kJ/(kg K) at a temperature range of -71 to 124°C.
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The enthalpy of water vapour is given by the equation H_w = 2501.4 + 1.88 T_a.
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Air-vapour mixtures exactly follow the perfect gas laws.
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The Gibbs-Dalton law is not applicable to atmospheric air-steam mixtures.
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The total pressure exerted by an air-vapour mixture is equal to the sum of the partial pressures of the constituent gases.
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The atmospheric air exists at a total pressure equal to the atmospheric pressure.
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Water molecules present in an air-vapour mixture do not exert pressure on the surroundings.
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