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Thermodynamics

Question
CBSEENCH11006181
Wired Faculty App

What do you mean by enthalpy (heat) of combustion? Give three examples.

Solution
It is the enthalpy change accompanying the complete combustion of one mole of a substance in excess of oxygen or air e.g.
(i) Combustion of carbon:
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(ii) Combustion of methane:
   CH subscript 4 left parenthesis straight g right parenthesis space plus space 2 straight O subscript 2 left parenthesis straight g right parenthesis space space space rightwards arrow space CO subscript 2 left parenthesis straight g right parenthesis space plus space 2 straight H subscript 2 straight O left parenthesis l right parenthesis semicolon space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space increment straight H space equals space minus 890.3 space kJ
(iii) Combustion of ethyl alcohol:
        straight C subscript 2 straight H subscript 5 OH left parenthesis straight l right parenthesis space plus space 3 straight O subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space space 2 CO subscript 2 left parenthesis straight g right parenthesis space plus space 3 straight H subscript 2 straight O left parenthesis straight l right parenthesis semicolon space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space increment straight H space equals negative 1367.4 space kJ

Some More Questions From Thermodynamics Chapter

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?

What is a state function?

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