the enthalpy of vapourization of liquid is 30 kj mol 1 and

The enthalpy of vapourization of liquid is $$30\,kJ\,mo{l^{ - 1}}$$ and entropy of vapourization is $$75\,J\,mo{l^{ - 1}}K.$$ The boiling point of the liquid at 1 atm is

A. $$250 K$$

B. $$400 K$$

C. $$450 K$$

D. $$600 K$$

Answer : $$400 K$$

Solution :
$$\eqalign{ & \Delta S = \frac{{\Delta {Q_{rev.}}}}{T}\,\,;\,\,\,75 = \frac{{30 \times {{10}^3}}}{T} \cr & \therefore \,\,T = 400\,K \cr} $$

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

View Answer

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.

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The enthalpy of vapourization of liquid is $$30\,kJ\,mo{l^{ - 1}}$$ and entropy of vapourization is $$75\,J\,mo{l^{ - 1}}K.$$ The boiling point of the liquid at 1 atm is

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

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The enthalpy of vapourization of liquid is $$30\,kJ\,mo{l^{ - 1}}$$ and entropy of vapourization is $$75\,J\,mo{l^{ - 1}}K.$$ The boiling point of the liquid at 1 atm is

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