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Thermodynamics

Question
CBSEENCH11006200
Wired Faculty App

When 1 gm of liquid naphthalene (C10H8) solidifies, 49 joules of heat is evolved. Calculate the enthalpy of fusion of naphthalene.

Solution
Gram molecular mass of naphthalene (C10H8) = 10 x 12 + 8 x 1 = 128 g
Heat evolved in the solidification of 1 g of naphthalene = 149 J
Heat evolved in the solidification of 128g of naphthalene =149 x 128 
                                                                                         = 19072 J
                                                                                         = 19.072 kJ
 therefore space space Enthalpy space of space solidification space left parenthesis increment straight H right parenthesis space equals space minus 19.072 space kJ therefore space space space Enthalpy space of space fusion space open parentheses increment subscript fus straight H to the power of 0 close parentheses space equals space plus 19.072 space kJ

Some More Questions From Thermodynamics Chapter

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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