NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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Application +4 | -1

Enthalpies of formation of

\mathrm{CCl}_{4}(\mathrm{g}), \mathrm{H}_{2} \mathrm{O}(\mathrm{g})

\mathrm{CO}_{2}(\mathrm{g})

and

\mathrm{HCl}(\mathrm{g})

are

-105,-242,-349

and -92

\mathrm{kJ} \mathrm{mol}^{-1}

respectively. The magnitude of enthalpy of the reaction given below is _____

\mathrm{kJ}

\mathrm{mol}^{-1}

. (Nearest integer)

\mathrm{CCl}_{4}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{CO}_{2}(\mathrm{g})+4 \mathrm{HCl}(\mathrm{g})

View answer and explanation

Correct option: A

173

The correct answer is 173 because it is calculated by subtracting the sum of the enthalpies of formation of the reactants from the sum of the enthalpies of formation of the products.

More Questions from THERMODYNAMICS

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The internal energy of one mole of a gas is: An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If

{T_i}

is the initial temperature and

{T_f}

is the final temperature, which of the following statements is correct? For which of the process, ∆S is negative? The work done by a weightless piston in causing an expansion ∆V (at constant temperature), when the opposing pressure, P is variable, is given by: Assertion :- At constant pressure of the change

\mathrm{H}_2 \mathrm{O}(\mathrm{s}) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})

work done is negative.

Reason :- During phase transition work done is always negative. For the reaction,

\mathrm{X}_2 \mathrm{O_4(l}) \longrightarrow 2 \mathrm{XO}_2(\mathrm{g}), \Delta U=2.1 \mathrm{~kcal}, \Delta S=20 \mathrm{~cal} \mathrm{~K}^{-1}

300 \mathrm{~K}

. Hence,

\Delta G