Laws of Thermochemistry
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CHXI06:THERMODYNAMICS

369480 Given that \(\mathrm{\mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{xkJ}}\) \(\mathrm{2 \mathrm{CO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{ykJ}}\)
the enthalpy of formation of carbon monoxide will be

1 \(\mathrm{\dfrac{2 x-y}{2}}\)
2 \(\mathrm{\dfrac{y-2 x}{2}}\)
3 \(\mathrm{2 x-y}\)
4 \(\mathrm{y-2 x}\)
CHXI06:THERMODYNAMICS

369481 The heats of combustion of carbon and carbon monoxide are -393.5 and \(\mathrm{-283.5 \mathrm{~kJ} \mathrm{~mol}^{-1}}\), respectively. The heat of formation (in \(\mathrm{\mathrm{kJ}}\) ) of carbon monoxide per mole is:

1 \({\rm{ - 676}}{\rm{.5}}\)
2 \({\rm{ - 110}}{\rm{.5}}\)
3 110.5
4 676.5
CHXI06:THERMODYNAMICS

369482 The following two reaction are known
\({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}({\rm{s}}){\rm{ + 3CO}}({\rm{g}}) \to {\rm{2Fe}}({\rm{s}}){\rm{ + 3C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 26}}.{\rm{8}}\;{\rm{kJ}}\)
\({\rm{FeO}}({\rm{s}}){\rm{ + CO}}({\rm{g}}) \to {\rm{Fe}}({\rm{s}}){\rm{ + C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 16}}.{\rm{5}}\;{\rm{kJ}}\)
The value of \(\mathrm{\Delta H}\) for the following reaction \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}(s)+\mathrm{CO}(\mathrm{g}) \longrightarrow 2 \mathrm{FeO}(s)+\mathrm{CO}_{2}(\mathrm{~g})}\) is

1 \(\mathrm{+10.3 \mathrm{~kJ}}\)
2 \(\mathrm{-43.3 \mathrm{~kJ}}\)
3 \(\mathrm{-10.3 \mathrm{~kJ}}\)
4 \(\mathrm{6.2 \mathrm{~kJ}}\)
CHXI06:THERMODYNAMICS

369483 Use the following data to calculate x and y in \(\mathrm{kcal} / \mathrm{mol}\)
(1) \(\mathrm{Na}(\mathrm{g}) \rightarrow \mathrm{Na}^{\oplus}(\mathrm{g})+\mathrm{e}^{-} ; \Delta \mathrm{H}=119.5\) \(\mathrm{kcal} / \mathrm{mol}\)
(2) \(\frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{Cl}}({\rm{g}});\Delta {\rm{H}} = {\rm{x}}\,\,{\rm{kcal}}/{\rm{mol}}\)
(3) \({\text{Na}}({\text{s}}) \to {\text{Na}}({\text{g}});\Delta {\text{H}} = {\text{y}}\,\,{\text{kcal}}/{\text{mol}}\)
(4) \(\mathrm{Cl}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \mathrm{Cl}^{-}(\mathrm{g}) ; \Delta \mathrm{H}=-87.3 \mathrm{kcal} /\) mol
\((5)\,\,{\rm{Na}}({\rm{s}}) + \frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 98.3\,{\rm{kcal}}/{\rm{mol}}\)
\((6)\,\,{\rm{N}}{{\rm{a}}^ \oplus }({\rm{g}}) + {\rm{C}}{{\rm{l}}^ - }({\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 185.3\,\,{\rm{kcal}}/{\rm{mol}}\)
(7) \(({\rm{x}} - {\rm{y}}) = 3\,{\rm{kcal}}/{\rm{mol}}\)

1 x = 30.3, y = 27.3
2 x = 22.3, y = 19.3
3 x = 43.2, y = 40.2
4 x = 28.9, y = 25.9
CHXI06:THERMODYNAMICS

369484 Identify the correct representation of I, II, III from the following
supporting img

1 \(\,\,\,\,\,\,\,\,\,\,{\rm{I}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{II}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{III}}\)
\(\,\,\,\,\,\,\,{{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\)
2 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
3 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
4 \(\,\,\,\,{\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\)
NEET DIGITAL LIBRARY
CHXI06:THERMODYNAMICS

369480 Given that \(\mathrm{\mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{xkJ}}\) \(\mathrm{2 \mathrm{CO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{ykJ}}\)
the enthalpy of formation of carbon monoxide will be

1 \(\mathrm{\dfrac{2 x-y}{2}}\)
2 \(\mathrm{\dfrac{y-2 x}{2}}\)
3 \(\mathrm{2 x-y}\)
4 \(\mathrm{y-2 x}\)
CHXI06:THERMODYNAMICS

369481 The heats of combustion of carbon and carbon monoxide are -393.5 and \(\mathrm{-283.5 \mathrm{~kJ} \mathrm{~mol}^{-1}}\), respectively. The heat of formation (in \(\mathrm{\mathrm{kJ}}\) ) of carbon monoxide per mole is:

1 \({\rm{ - 676}}{\rm{.5}}\)
2 \({\rm{ - 110}}{\rm{.5}}\)
3 110.5
4 676.5
CHXI06:THERMODYNAMICS

369482 The following two reaction are known
\({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}({\rm{s}}){\rm{ + 3CO}}({\rm{g}}) \to {\rm{2Fe}}({\rm{s}}){\rm{ + 3C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 26}}.{\rm{8}}\;{\rm{kJ}}\)
\({\rm{FeO}}({\rm{s}}){\rm{ + CO}}({\rm{g}}) \to {\rm{Fe}}({\rm{s}}){\rm{ + C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 16}}.{\rm{5}}\;{\rm{kJ}}\)
The value of \(\mathrm{\Delta H}\) for the following reaction \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}(s)+\mathrm{CO}(\mathrm{g}) \longrightarrow 2 \mathrm{FeO}(s)+\mathrm{CO}_{2}(\mathrm{~g})}\) is

1 \(\mathrm{+10.3 \mathrm{~kJ}}\)
2 \(\mathrm{-43.3 \mathrm{~kJ}}\)
3 \(\mathrm{-10.3 \mathrm{~kJ}}\)
4 \(\mathrm{6.2 \mathrm{~kJ}}\)
CHXI06:THERMODYNAMICS

369483 Use the following data to calculate x and y in \(\mathrm{kcal} / \mathrm{mol}\)
(1) \(\mathrm{Na}(\mathrm{g}) \rightarrow \mathrm{Na}^{\oplus}(\mathrm{g})+\mathrm{e}^{-} ; \Delta \mathrm{H}=119.5\) \(\mathrm{kcal} / \mathrm{mol}\)
(2) \(\frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{Cl}}({\rm{g}});\Delta {\rm{H}} = {\rm{x}}\,\,{\rm{kcal}}/{\rm{mol}}\)
(3) \({\text{Na}}({\text{s}}) \to {\text{Na}}({\text{g}});\Delta {\text{H}} = {\text{y}}\,\,{\text{kcal}}/{\text{mol}}\)
(4) \(\mathrm{Cl}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \mathrm{Cl}^{-}(\mathrm{g}) ; \Delta \mathrm{H}=-87.3 \mathrm{kcal} /\) mol
\((5)\,\,{\rm{Na}}({\rm{s}}) + \frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 98.3\,{\rm{kcal}}/{\rm{mol}}\)
\((6)\,\,{\rm{N}}{{\rm{a}}^ \oplus }({\rm{g}}) + {\rm{C}}{{\rm{l}}^ - }({\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 185.3\,\,{\rm{kcal}}/{\rm{mol}}\)
(7) \(({\rm{x}} - {\rm{y}}) = 3\,{\rm{kcal}}/{\rm{mol}}\)

1 x = 30.3, y = 27.3
2 x = 22.3, y = 19.3
3 x = 43.2, y = 40.2
4 x = 28.9, y = 25.9
CHXI06:THERMODYNAMICS

369484 Identify the correct representation of I, II, III from the following
supporting img

1 \(\,\,\,\,\,\,\,\,\,\,{\rm{I}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{II}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{III}}\)
\(\,\,\,\,\,\,\,{{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\)
2 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
3 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
4 \(\,\,\,\,{\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\)
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CHXI06:THERMODYNAMICS

369480 Given that \(\mathrm{\mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{xkJ}}\) \(\mathrm{2 \mathrm{CO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{ykJ}}\)
the enthalpy of formation of carbon monoxide will be

1 \(\mathrm{\dfrac{2 x-y}{2}}\)
2 \(\mathrm{\dfrac{y-2 x}{2}}\)
3 \(\mathrm{2 x-y}\)
4 \(\mathrm{y-2 x}\)
CHXI06:THERMODYNAMICS

369481 The heats of combustion of carbon and carbon monoxide are -393.5 and \(\mathrm{-283.5 \mathrm{~kJ} \mathrm{~mol}^{-1}}\), respectively. The heat of formation (in \(\mathrm{\mathrm{kJ}}\) ) of carbon monoxide per mole is:

1 \({\rm{ - 676}}{\rm{.5}}\)
2 \({\rm{ - 110}}{\rm{.5}}\)
3 110.5
4 676.5
CHXI06:THERMODYNAMICS

369482 The following two reaction are known
\({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}({\rm{s}}){\rm{ + 3CO}}({\rm{g}}) \to {\rm{2Fe}}({\rm{s}}){\rm{ + 3C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 26}}.{\rm{8}}\;{\rm{kJ}}\)
\({\rm{FeO}}({\rm{s}}){\rm{ + CO}}({\rm{g}}) \to {\rm{Fe}}({\rm{s}}){\rm{ + C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 16}}.{\rm{5}}\;{\rm{kJ}}\)
The value of \(\mathrm{\Delta H}\) for the following reaction \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}(s)+\mathrm{CO}(\mathrm{g}) \longrightarrow 2 \mathrm{FeO}(s)+\mathrm{CO}_{2}(\mathrm{~g})}\) is

1 \(\mathrm{+10.3 \mathrm{~kJ}}\)
2 \(\mathrm{-43.3 \mathrm{~kJ}}\)
3 \(\mathrm{-10.3 \mathrm{~kJ}}\)
4 \(\mathrm{6.2 \mathrm{~kJ}}\)
CHXI06:THERMODYNAMICS

369483 Use the following data to calculate x and y in \(\mathrm{kcal} / \mathrm{mol}\)
(1) \(\mathrm{Na}(\mathrm{g}) \rightarrow \mathrm{Na}^{\oplus}(\mathrm{g})+\mathrm{e}^{-} ; \Delta \mathrm{H}=119.5\) \(\mathrm{kcal} / \mathrm{mol}\)
(2) \(\frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{Cl}}({\rm{g}});\Delta {\rm{H}} = {\rm{x}}\,\,{\rm{kcal}}/{\rm{mol}}\)
(3) \({\text{Na}}({\text{s}}) \to {\text{Na}}({\text{g}});\Delta {\text{H}} = {\text{y}}\,\,{\text{kcal}}/{\text{mol}}\)
(4) \(\mathrm{Cl}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \mathrm{Cl}^{-}(\mathrm{g}) ; \Delta \mathrm{H}=-87.3 \mathrm{kcal} /\) mol
\((5)\,\,{\rm{Na}}({\rm{s}}) + \frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 98.3\,{\rm{kcal}}/{\rm{mol}}\)
\((6)\,\,{\rm{N}}{{\rm{a}}^ \oplus }({\rm{g}}) + {\rm{C}}{{\rm{l}}^ - }({\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 185.3\,\,{\rm{kcal}}/{\rm{mol}}\)
(7) \(({\rm{x}} - {\rm{y}}) = 3\,{\rm{kcal}}/{\rm{mol}}\)

1 x = 30.3, y = 27.3
2 x = 22.3, y = 19.3
3 x = 43.2, y = 40.2
4 x = 28.9, y = 25.9
CHXI06:THERMODYNAMICS

369484 Identify the correct representation of I, II, III from the following
supporting img

1 \(\,\,\,\,\,\,\,\,\,\,{\rm{I}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{II}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{III}}\)
\(\,\,\,\,\,\,\,{{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\)
2 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
3 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
4 \(\,\,\,\,{\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\)
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CHXI06:THERMODYNAMICS

369480 Given that \(\mathrm{\mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{xkJ}}\) \(\mathrm{2 \mathrm{CO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{ykJ}}\)
the enthalpy of formation of carbon monoxide will be

1 \(\mathrm{\dfrac{2 x-y}{2}}\)
2 \(\mathrm{\dfrac{y-2 x}{2}}\)
3 \(\mathrm{2 x-y}\)
4 \(\mathrm{y-2 x}\)
CHXI06:THERMODYNAMICS

369481 The heats of combustion of carbon and carbon monoxide are -393.5 and \(\mathrm{-283.5 \mathrm{~kJ} \mathrm{~mol}^{-1}}\), respectively. The heat of formation (in \(\mathrm{\mathrm{kJ}}\) ) of carbon monoxide per mole is:

1 \({\rm{ - 676}}{\rm{.5}}\)
2 \({\rm{ - 110}}{\rm{.5}}\)
3 110.5
4 676.5
CHXI06:THERMODYNAMICS

369482 The following two reaction are known
\({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}({\rm{s}}){\rm{ + 3CO}}({\rm{g}}) \to {\rm{2Fe}}({\rm{s}}){\rm{ + 3C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 26}}.{\rm{8}}\;{\rm{kJ}}\)
\({\rm{FeO}}({\rm{s}}){\rm{ + CO}}({\rm{g}}) \to {\rm{Fe}}({\rm{s}}){\rm{ + C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 16}}.{\rm{5}}\;{\rm{kJ}}\)
The value of \(\mathrm{\Delta H}\) for the following reaction \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}(s)+\mathrm{CO}(\mathrm{g}) \longrightarrow 2 \mathrm{FeO}(s)+\mathrm{CO}_{2}(\mathrm{~g})}\) is

1 \(\mathrm{+10.3 \mathrm{~kJ}}\)
2 \(\mathrm{-43.3 \mathrm{~kJ}}\)
3 \(\mathrm{-10.3 \mathrm{~kJ}}\)
4 \(\mathrm{6.2 \mathrm{~kJ}}\)
CHXI06:THERMODYNAMICS

369483 Use the following data to calculate x and y in \(\mathrm{kcal} / \mathrm{mol}\)
(1) \(\mathrm{Na}(\mathrm{g}) \rightarrow \mathrm{Na}^{\oplus}(\mathrm{g})+\mathrm{e}^{-} ; \Delta \mathrm{H}=119.5\) \(\mathrm{kcal} / \mathrm{mol}\)
(2) \(\frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{Cl}}({\rm{g}});\Delta {\rm{H}} = {\rm{x}}\,\,{\rm{kcal}}/{\rm{mol}}\)
(3) \({\text{Na}}({\text{s}}) \to {\text{Na}}({\text{g}});\Delta {\text{H}} = {\text{y}}\,\,{\text{kcal}}/{\text{mol}}\)
(4) \(\mathrm{Cl}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \mathrm{Cl}^{-}(\mathrm{g}) ; \Delta \mathrm{H}=-87.3 \mathrm{kcal} /\) mol
\((5)\,\,{\rm{Na}}({\rm{s}}) + \frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 98.3\,{\rm{kcal}}/{\rm{mol}}\)
\((6)\,\,{\rm{N}}{{\rm{a}}^ \oplus }({\rm{g}}) + {\rm{C}}{{\rm{l}}^ - }({\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 185.3\,\,{\rm{kcal}}/{\rm{mol}}\)
(7) \(({\rm{x}} - {\rm{y}}) = 3\,{\rm{kcal}}/{\rm{mol}}\)

1 x = 30.3, y = 27.3
2 x = 22.3, y = 19.3
3 x = 43.2, y = 40.2
4 x = 28.9, y = 25.9
CHXI06:THERMODYNAMICS

369484 Identify the correct representation of I, II, III from the following
supporting img

1 \(\,\,\,\,\,\,\,\,\,\,{\rm{I}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{II}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{III}}\)
\(\,\,\,\,\,\,\,{{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\)
2 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
3 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
4 \(\,\,\,\,{\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\)
NEET DIGITAL LIBRARY
CHXI06:THERMODYNAMICS

369480 Given that \(\mathrm{\mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{xkJ}}\) \(\mathrm{2 \mathrm{CO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{CO}_{2} ; \Delta \mathrm{H}^{\mathrm{o}}=-\mathrm{ykJ}}\)
the enthalpy of formation of carbon monoxide will be

1 \(\mathrm{\dfrac{2 x-y}{2}}\)
2 \(\mathrm{\dfrac{y-2 x}{2}}\)
3 \(\mathrm{2 x-y}\)
4 \(\mathrm{y-2 x}\)
CHXI06:THERMODYNAMICS

369481 The heats of combustion of carbon and carbon monoxide are -393.5 and \(\mathrm{-283.5 \mathrm{~kJ} \mathrm{~mol}^{-1}}\), respectively. The heat of formation (in \(\mathrm{\mathrm{kJ}}\) ) of carbon monoxide per mole is:

1 \({\rm{ - 676}}{\rm{.5}}\)
2 \({\rm{ - 110}}{\rm{.5}}\)
3 110.5
4 676.5
CHXI06:THERMODYNAMICS

369482 The following two reaction are known
\({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}({\rm{s}}){\rm{ + 3CO}}({\rm{g}}) \to {\rm{2Fe}}({\rm{s}}){\rm{ + 3C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 26}}.{\rm{8}}\;{\rm{kJ}}\)
\({\rm{FeO}}({\rm{s}}){\rm{ + CO}}({\rm{g}}) \to {\rm{Fe}}({\rm{s}}){\rm{ + C}}{{\rm{O}}_{\rm{2}}}({\rm{g}});\)
\(\Delta {\rm{H = - 16}}.{\rm{5}}\;{\rm{kJ}}\)
The value of \(\mathrm{\Delta H}\) for the following reaction \(\mathrm{\mathrm{Fe}_{2} \mathrm{O}_{3}(s)+\mathrm{CO}(\mathrm{g}) \longrightarrow 2 \mathrm{FeO}(s)+\mathrm{CO}_{2}(\mathrm{~g})}\) is

1 \(\mathrm{+10.3 \mathrm{~kJ}}\)
2 \(\mathrm{-43.3 \mathrm{~kJ}}\)
3 \(\mathrm{-10.3 \mathrm{~kJ}}\)
4 \(\mathrm{6.2 \mathrm{~kJ}}\)
CHXI06:THERMODYNAMICS

369483 Use the following data to calculate x and y in \(\mathrm{kcal} / \mathrm{mol}\)
(1) \(\mathrm{Na}(\mathrm{g}) \rightarrow \mathrm{Na}^{\oplus}(\mathrm{g})+\mathrm{e}^{-} ; \Delta \mathrm{H}=119.5\) \(\mathrm{kcal} / \mathrm{mol}\)
(2) \(\frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{Cl}}({\rm{g}});\Delta {\rm{H}} = {\rm{x}}\,\,{\rm{kcal}}/{\rm{mol}}\)
(3) \({\text{Na}}({\text{s}}) \to {\text{Na}}({\text{g}});\Delta {\text{H}} = {\text{y}}\,\,{\text{kcal}}/{\text{mol}}\)
(4) \(\mathrm{Cl}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \mathrm{Cl}^{-}(\mathrm{g}) ; \Delta \mathrm{H}=-87.3 \mathrm{kcal} /\) mol
\((5)\,\,{\rm{Na}}({\rm{s}}) + \frac{1}{2}{\rm{C}}{{\rm{l}}_2}(\;{\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 98.3\,{\rm{kcal}}/{\rm{mol}}\)
\((6)\,\,{\rm{N}}{{\rm{a}}^ \oplus }({\rm{g}}) + {\rm{C}}{{\rm{l}}^ - }({\rm{g}}) \to {\rm{NaCl}}({\rm{s}});\)
\(\Delta {\rm{H}} = - 185.3\,\,{\rm{kcal}}/{\rm{mol}}\)
(7) \(({\rm{x}} - {\rm{y}}) = 3\,{\rm{kcal}}/{\rm{mol}}\)

1 x = 30.3, y = 27.3
2 x = 22.3, y = 19.3
3 x = 43.2, y = 40.2
4 x = 28.9, y = 25.9
CHXI06:THERMODYNAMICS

369484 Identify the correct representation of I, II, III from the following
supporting img

1 \(\,\,\,\,\,\,\,\,\,\,{\rm{I}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{II}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{III}}\)
\(\,\,\,\,\,\,\,{{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\)
2 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
3 \({{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\)
4 \(\,\,\,\,{\mkern 1mu} {{\rm{\Delta }}_{{\rm{sol}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{hyd}}}}{\rm{H^\circ }}\quad {\mkern 1mu} {\mkern 1mu} {{\rm{\Delta }}_{{\rm{lattice}}}}{\rm{H^\circ }}\)