When one mole of a solid ‘S’ (molecular weight 46) at its melting point is changed into the liquid at the same temperature, an entropy change of 26.4 JK^–1takes place. Calculate the melting point of the solid if its enthalpy of fusion is 0 .1 kJg^–1.

Solution

$Here space space increment straight S space equals space 26.4 space JK to the power of negative 1 end exponent space mol to the power of negative 1 end exponent space increment straight H subscript straight f space equals space 0.1 space cross times space 10 to the power of negative 3 end exponent space cross times space 46 space straight J space mol to the power of negative 1 end exponent space space space space space space space space space space space equals 4600 space straight J space mol to the power of negative 1 end exponent We space know comma space space space increment straight S subscript straight f space equals space fraction numerator increment straight H subscript straight f over denominator straight T end fraction or space space space space space space space space space space straight T space equals space fraction numerator increment straight H subscript straight f over denominator increment straight S subscript straight f end fraction or space space space space space space space space space space straight T space equals space fraction numerator 4600 space straight J space mol to the power of negative 1 end exponent over denominator 26.4 space JK to the power of negative 1 end exponent space mol to the power of negative 1 end exponent end fraction space space space space space space space space space space space space space space space equals space 174.24 space straight K. space space space space space space space space space$

Some More Questions From Thermodynamics Chapter

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Thermodynamics

When one mole of a solid ‘S’ (molecular weight 46) at its melting point is changed into the liquid at the same temperature, an entropy change of 26.4 JK^–1takes place. Calculate the melting point of the solid if its enthalpy of fusion is 0 .1 kJg^–1.

Some More Questions From Thermodynamics Chapter

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?

A thermodynamic state function is a quantity

What is reversible process in thermodynamics?

Define irreversible change.

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Thermodynamics

When one mole of a solid ‘S’ (molecular weight 46) at its melting point is changed into the liquid at the same temperature, an entropy change of 26.4 JK–1 takes place. Calculate the melting point of the solid if its enthalpy of fusion is 0 .1 kJg–1.

Some More Questions From Thermodynamics Chapter

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?

A thermodynamic state function is a quantity

What is reversible process in thermodynamics?

Define irreversible change.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

When one mole of a solid ‘S’ (molecular weight 46) at its melting point is changed into the liquid at the same temperature, an entropy change of 26.4 JK^–1takes place. Calculate the melting point of the solid if its enthalpy of fusion is 0 .1 kJg^–1.