Stoichiometry
Enthalpy of formation of NH₃ is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH₃ → N₂ + 3H₂, is equal to __________ kJ/kg. mole.

-92
46
-23
92

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Stoichiometry
An ideal gas can be liquified, because

Its critical temperature is more than 0°C
Forces operative between its molecules are negligible
Its molecular size is very small
It gets solidified directly without becoming liquid

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Stoichiometry
Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

All of these
Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution
Attractive forces between like and unlike molecules are approximately equal
Sizes of the component molecules are approximately equal

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