Compute the enthalpy of hydrogenation of ethylene if the bond enthalpies of H – H, C – H, C – C and C = C bonds are 436, 485, 347 and 619 kJ mol–1 respectively.
The required thermochemical equation is
Thus enthalpy of hydrogenation of ethylene is -262 kJ.
Define thermodynamics.
What do you understand by the terms: the system and surroundings?
Classify the following into different types of systems:
(i) Tea placed in a cup
(ii) Tea placed in a tea-pot
(iii) Tea placed in a thermosflask.
Define a closed system.
Define an isolated system.
Define intensive properties.
Define extensive properties.
Why all living systems need to be 'open systems'?
Define state variables of a system.
From thermodynamic point of view, to which system the animals and plants belong?
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