JEE Main · Chemistry

Chemical thermodynamics and thermochemistry

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An ideal gas expands isothermally and reversibly from $2 L$ to $20 L$ at $300 K$ . For $1 mol$ of gas, what is the magnitude of work done by the gas? (Given…
For the gaseous reaction $N_{2} (g) + 3 H_{2} (g) \to 2N H_{3} (g)$ at $298 K$ , $Δ H^{\circ} = - 92.4 kJ$ . Assuming ideal gas behavior, what is $Δ U^{\circ}$ for this reacti…
A sample of $1 mol$ of a monoatomic ideal gas ( $γ = 5/3$ ) initially at $300 K$ undergoes a reversible adiabatic expansion to 8 times its initial volume. What is the final temperat…
Given the thermochemical equations:
$C (graphite) + O_{2} (g) \to C O_{2} (g), Δ H^{\circ} = - 393.5 kJ/mol$
…
For a chemical reaction at $298 K$ , $Δ H^{\circ} = + 30.5 kJ/mol$ and $Δ S^{\circ} = + 61.0 J \cdot K^{- 1} \cdot mol^{- 1}$ . At what minimum temperature will this…
One mole of an ideal gas expands against a constant external pressure of $1.0 bar$ from a volume of $10.0 L$ to $25.0 L$ . If the process is carried out at constant temperature…
The standard enthalpy of combustion of liquid benzene $C_{6} H_{6} (l)$ is $- 3267 kJ/mol$ . The standard enthalpies of formation of $C O_{2} (g)$ and $H_{2} O (l)$ are…
For the vaporization of water at $373 K$ , $Δ H_{v a p} = 40.7 kJ/mol$ . What is the standard entropy of vaporization $Δ S_{v a p}$ of water?
What is the change in entropy when $2 mol$ of an ideal monoatomic gas is heated from $300 K$ to $600 K$ at constant volume? (Given: $C_{v} = \frac{3}{2} R$ …
The heat of neutralization of a strong acid by a strong base is $- 57.1 kJ/equivalent$ . When $1 mol$ of $HCN$ is neutralized by $1 mol$ of $NaOH$ , the heat evo…
For the equilibrium $PC l_{5} (g) ⇌ PC l_{3} (g) + C l_{2} (g)$ at $298 K$ , $K_{p} = 1.8 \times 1 0^{- 1}$ . What is the value of $Δ G^{\circ}$ for this reaction? (Given…
The bond dissociation enthalpies of $H - H$ , $Cl - Cl$ , and $H - Cl$ are $434 kJ/mol$ , $242 kJ/mol$ , and $431 kJ/mol$ respectively. What is the standard en…
For which of the following processes is the entropy change $Δ S$ negative?
A system absorbs $500 J$ of heat and performs $300 J$ of work on its surroundings. What is the change in internal energy $Δ U$ of the system?
The molar heat capacity of water at constant pressure is $C_{p, m} = 75.3 J \cdot K^{- 1} \cdot mol^{- 1}$ . How much heat is required to raise the temperature of $180 g$ of wate…
For the reaction $2S O_{2} (g) + O_{2} (g) \to 2S O_{3} (g)$ , $Δ H = - 198 kJ$ . The reaction is spontaneous at low temperatures but non-spontaneous at very high temperatures. Which s…
Two moles of an ideal monoatomic gas undergo an adiabatic reversible compression from volume $V_{1}$ to $V_{2} = V_{1} /4$ . What is the ratio of final pressure to initial pressure $P_{2} / P_{1}$ ?
The resonance energy of benzene is defined as the difference between the experimental enthalpy of hydrogenation and the calculated enthalpy of hypothetical 1,3,5-cyclohexatriene. If the enthalpy of hy…
What is the standard entropy of a perfectly crystalline solid substance at absolute zero ( $0 K$ ), according to the Third Law of Thermodynamics?
For an adiabatic free expansion of an ideal gas into an evacuated vessel (vacuum), which of the following sets of thermodynamic parameters is correct?
The heat capacity of a monoatomic ideal gas at constant volume is $C_{v} = \frac{3}{2} R$ . What is its molar heat capacity at constant pressure $C_{p}$ and its Poisson ratio $γ$ ?
The enthalpy of formation of liquid water is $- 285.8 kJ/mol$ and that of steam is $- 241.8 kJ/mol$ . What is the enthalpy of vaporization of water?
For which of the following gaseous reactions is $Δ H = Δ U$ ?
An intensive property is one that does not depend on the quantity of matter present. Which of the following is an intensive property?
The enthalpy of combustion of carbon to $C O_{2}$ is $- 393.5 kJ/mol$ . How much heat is released upon the complete combustion of $36.0 g$ of carbon?

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