one mole of an ideal gas is expanded isothermally and

One mole of an ideal gas is expanded isothermally and reversibly to half of its initial pressure. $$\Delta S$$ for the process in $$J\,{K^{ - 1}}\,mo{l^{ - 1}}$$ is $$\left[ {\ell n\,\,2 = 0.693\,{\text{and}}\,R = 8.314,J/\left( {mol\,K} \right)} \right]$$

A. 6.76

B. 5.76

C. 10.76

D. 8.03

Answer : 5.76

Solution :
$$\eqalign{ & {\text{For isothermal process}}\,\,\left( {\Delta T = 0} \right) \cr & \Delta S = R\,\,\ell n\frac{{{P_1}}}{{{P_2}}} = 8.314\,\,\ell n\,\,2 \cr & = 8.314 \times 0.693 \cr & = 5.76 \cr} $$

Releted MCQ Question on
Physical Chemistry >> Chemical Thermodynamics

Releted Question 1

The difference between heats of reaction at constant pressure and constant volume for the reaction : $$2{C_6}{H_6}\left( l \right) + 15{O_{2\left( g \right)}} \to $$ $$12C{O_2}\left( g \right) + 6{H_2}O\left( l \right)$$ at $${25^ \circ }C$$ in $$kJ$$ is

A. $$-$$ 7.43

B. $$+$$ 3.72

C. $$-$$ 3.72

D. $$+$$ 7.43

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Releted Question 2

For which change $$\Delta H \ne \Delta E\,:$$

A. $${H_{2\left( g \right)}} + {I_{2\left( g \right)}} \to 2HI\left( g \right)$$

B. $$HC{\text{l}} + NaOH \to NaC{\text{l}}$$

C. $${C_{\left( s \right)}} + {O_{{2_{\left( g \right)}}}} \to C{o_{{2_{\left( g \right)}}}}$$

D. $${N_2}\left( g \right) + 3{H_2}\left( g \right) \to 2N{H_3}\left( g \right)$$

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Releted Question 3

$${\text{The}}\,\Delta H_f^0\,{\text{for}}\,C{O_2}\left( g \right),\,CO\left( g \right)\,$$ and $${H_2}O\left( g \right)$$ are $$-393.5,$$ $$-110.5$$ and $$ - 241.8\,kJ\,mo{l^{ - 1}}$$ respectively. The standard enthalpy change ( in $$kJ$$ ) for the reaction $$C{O_2}\left( g \right) + {H_2}\left( g \right) \to CO\left( g \right) + {H_2}O\left( g \right)\,{\text{is}}$$

A. 524.1

B. 41.2

C. -262.5

D. -41.2

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Releted Question 4

In thermodynamics, a process is called reversible when

A. surroundings and system change into each other.

B. there is no boundary between system and surroundings.

C. the surroundings are always in equilibrium with the system.

D. the system changes into the surroundings spontaneously.

View Answer

One mole of an ideal gas is expanded isothermally and reversibly to half of its initial pressure. $$\Delta S$$ for the process in $$J\,{K^{ - 1}}\,mo{l^{ - 1}}$$ is $$\left[ {\ell n\,\,2 = 0.693\,{\text{and}}\,R = 8.314,J/\left( {mol\,K} \right)} \right]$$

Releted MCQ Question on
Physical Chemistry >> Chemical Thermodynamics

The difference between heats of reaction at constant pressure and constant volume for the reaction : $$2{C_6}{H_6}\left( l \right) + 15{O_{2\left( g \right)}} \to $$ $$12C{O_2}\left( g \right) + 6{H_2}O\left( l \right)$$ at $${25^ \circ }C$$ in $$kJ$$ is

For which change $$\Delta H \ne \Delta E\,:$$

In thermodynamics, a process is called reversible when

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Chemical Thermodynamics

Practice More MCQ Question on Chemistry Section

One mole of an ideal gas is expanded isothermally and reversibly to half of its initial pressure. $$\Delta S$$ for the process in $$J\,{K^{ - 1}}\,mo{l^{ - 1}}$$ is $$\left[ {\ell n\,\,2 = 0.693\,{\text{and}}\,R = 8.314,J/\left( {mol\,K} \right)} \right]$$

Releted MCQ Question on Physical Chemistry >> Chemical Thermodynamics

The difference between heats of reaction at constant pressure and constant volume for the reaction : $$2{C_6}{H_6}\left( l \right) + 15{O_{2\left( g \right)}} \to $$ $$12C{O_2}\left( g \right) + 6{H_2}O\left( l \right)$$ at $${25^ \circ }C$$ in $$kJ$$ is

For which change $$\Delta H \ne \Delta E\,:$$

In thermodynamics, a process is called reversible when

Practice More Releted MCQ Question on Chemical Thermodynamics

Practice More MCQ Question on Chemistry Section

Releted MCQ Question on
Physical Chemistry >> Chemical Thermodynamics

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Chemical Thermodynamics