(B) For an ideal gas,the entropy change $\Delta S$ is given by the general expression: $\Delta S = n C_p \ln \left( \frac{T_f}{T_i} \right) + n R \ln

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$\Delta S = nR \ln \left( \frac{p_i}{p_f} \right)$

(B) For an ideal gas,the entropy change $\Delta S$ is given by the general expression: $\Delta S = n C_p \ln \left( \frac{T_f}{T_i} \right) + n R \ln \left( \frac{p_i}{p_f} \right)$ For an isothermal process,the temperature remains constant,so $T_i = T_f$. This implies $\ln \left( \frac{T_f}{T_i} \right) = \ln(1) = 0$. Therefore,the expression simplifies to: $\Delta S = n R \ln \left( \frac{p_i}{p_f} \right)$

Class 11 Chemistry Thermodynamics 2 nd Law of thermodynamics and Entropy

Medium

For a sample of a perfect gas,when its pressure is changed isothermally from $p_i$ to $p_f$,the entropy change is given by:

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A
$\Delta S = nR \ln \left( \frac{p_f}{p_i} \right)$
B
$\Delta S = nR \ln \left( \frac{p_i}{p_f} \right)$
C
$\Delta S = nRT \ln \left( \frac{p_f}{p_i} \right)$
D
$\Delta S = RT \ln \left( \frac{p_i}{p_f} \right)$

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2 nd Law of thermodynamics and Entropy

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Find the correct statement.

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For a sample of a perfect gas,when its pressure is changed isothermally from $p_i$ to $p_f$,the entropy change is given by:

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For a reversible adiabatic expansion of an ideal gas,which of the following is equal to zero?

The $\Delta S$ for the vaporisation of $1 \ mol$ of water is $88.3 \ J/mol \ K$. The value of $\Delta S$ for the condensation of $1 \ mol$ of vapour will be.......$ J/mol \ K$

The enthalpy change for the conversion of water into vapor at $27^\circ C$ is $30 \ kJ/mol$. The entropy change for this process in $J/mol \ K$ is:

$A$ heat engine is operating between $500 \ K$ and $400 \ K$. If the engine absorbs $100 \ J$ of heat,which of the following is an impossible amount of heat rejected by the engine (in $J$)?

Find the correct statement.

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