Recent questions tagged chemical-thermodynamics

The heat change for the following reaction at 298 K and constant pressure is +7.3 kcal. $A_2B(s) \rightarrow 2A(s) + \frac{1}{2} B_2(g)$; $\Delta H = + 7.3 kcal$ The heat change at constant volume would be

asked Feb 24, 2014 by mosymeow_1

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The enthalpy change at 298 K of the reaction $H_2O_2(l) \longrightarrow H_2O (l) + \frac{1}{2} O_2 (g)$ is -23.5 kcal $mol^{-1}$ and enthalpy of formation of $H_2O_2(l)$ is -44.8 kcal $mol^{-1}$. The enthalpy of formation of $H_2O(l)$ is

asked Feb 24, 2014 by mosymeow_1

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The work done on the system when one mole of an ideal gas at 500 K is compressed isothermally and reversibly to 1/10th of its original volume (R = 2 cal)

asked Feb 24, 2014 by mosymeow_1

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An ideal gas expands from $10^{-3} m^3$ to $10^{-2} m^3$ at 300 K, against a constant pressure of $10^5 N m^{-2}$. The work done on it is

asked Feb 24, 2014 by mosymeow_1

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For the reaction between $CO_2$ and graphite $CO_2(g) + C(s) \longrightarrow 2CO(g)$ $\Delta H = +170.0 kJ$ and $\Delta S = 170 JK^{-1}$. The reaction is spontaneous at

asked Feb 24, 2014 by mosymeow_1

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An engine operating between $100^\circ C$ and $0^\circ C$ takes 453.6 Kcal of heat. How much useful work can be done by it?

asked Feb 24, 2014 by mosymeow_1

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What percent $T_1$ is of $T_2$ for a heat engine whose efficiency is 10%?

asked Feb 24, 2014 by mosymeow_1

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The heat change at constant volume for the decomposition of silver(I) oxide is found to be 30.66 kJ. The heat change at constant pressure will be

asked Feb 24, 2014 by mosymeow_1

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At 298 K, the enthalpy change for a given reaction K is $-x$ cal/mol. If the reaction occurs spontaneously at 298 K, the entropy change at that temperature

asked Feb 24, 2014 by mosymeow_1

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For the following thermodynamic process Dry ice $\longrightarrow CO_2$ (g)

asked Feb 24, 2014 by mosymeow_1

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The sign of $\Delta G$ for the process of melting of ice at 273 K and 1 atm pressure is

asked Feb 24, 2014 by mosymeow_1

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According to third law of thermodynamics, the entropy at 0 K is zero for

asked Feb 24, 2014 by mosymeow_1

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The value of $\Delta S$ is negative in which of the following process?

asked Feb 24, 2014 by mosymeow_1

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For the gaseous reaction involving the complete combustion of isobutane

asked Feb 24, 2014 by mosymeow_1

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Enthalpy of neutralisation of all strong acids and strong bases has the same value because

asked Feb 23, 2014 by mosymeow_1

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One gram of diamond atom of graphite and one gram atom of diamond were separately burnt to carbon dioxide. The amount of heat liberated were 393.5 kJ and 395.4 kJ respectively. It follows that

asked Feb 23, 2014 by mosymeow_1

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X gm of ethanal was subjected to combustion in a bomb calorimeter. The heat produced is Y joules. Then

asked Feb 23, 2014 by mosymeow_1

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The reaction $SO_2(g) + \frac{1}{2} O_2 (g) \longrightarrow SO_3(g)$ should be

asked Feb 23, 2014 by mosymeow_1

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Which of the following relationship is not correct?

asked Feb 23, 2014 by mosymeow_1

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At constant volume the heat of combustion of solid benzoic acid is -321.30 kJ at $27^\circ C$. The heat of combustion at constant pressure is

asked Feb 23, 2014 by mosymeow_1

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What is observed during isothermal expansion of an ideal gas?

asked Feb 23, 2014 by mosymeow_1

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When is the efficiency of a heat engine maximum?

asked Feb 23, 2014 by mosymeow_1

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Assertion:In a reversible exothermic,$E_{act}$ of forward $Rx^n$ is lower than that of backward $Rx^n$.Reason :The threshold energy of forward reaction is less than that of backward $Rx^n$

asked Dec 13, 2013 by sreemathi.v

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