Thermodynamics

For a reaction \(\mathrm{A}+\mathrm{B} \rightarrow\) products \(\Delta \mathrm{H}\) is \(-84.2 \mathrm{~kJ}\) and \(\Delta \mathrm{S}\) is \(-200 \mathrm{~J} \mathrm{~K}^{-1}\). Calculate the highest value of temperature so that the reactio...

Calculate the work done in the following reaction at \(300 \mathrm{~K}\) and at constant pressure.
\(\left(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right)\)
$$4 \mathrm{HCl}_{(\mathrm{g})}+\mathrm{O}_{2(\mathrm{~g})}...

Which of the following temperature values in Fahrenheit \(\left({ }^{\circ} \mathrm{F}\right)\) is equal to \(50^{\circ} \mathrm{C}\) ?

One mole of an ideal gas performs \(900 \mathrm{~J}\) of work on surrounding. If internal energy increases by \(625 \mathrm{~J}\), find the value of \(\Delta \mathrm{H}\).

Which of the following processes exhibits increase in internal energy?

An ideal gas absorbs \(210 \mathrm{~J}\) of heat and undergoes expansion from \(3 \mathrm{~L}\) to \(6 \mathrm{~L}\) against a constant external pressure of \(10^5 \mathrm{~Pa}\). What is the value of \(\Delta U\) ?

Which among the following is intensive and extensive properties respectively?

Two moles of an ideal gas expand freely and isothermally from \(5 \mathrm{~dm}^3\) to \(50 \mathrm{~dm}^3\). What is the value of \(\Delta H\) ?

Calculate amount of methane formed by liberation of \(149.6 \mathrm{~kJ}\) of heat using following equation.
$$\mathrm{C}_{(\mathrm{s})}+2 \mathrm{H}_{2(\mathrm{~g})} \longrightarrow \mathrm{CH}_{4(\mathrm{~g})} \quad \Delta \mathrm{H}=-74....

For reaction, \(\mathrm{CO}_{(\mathrm{g})}+\frac{1}{2} \mathrm{O}_{2(\mathrm{~g})} \longrightarrow \mathrm{CO}_{2(\mathrm{~g})}\)
Which of the following equations is CORRECT at constant \(\mathrm{T}\) and \(\mathrm{P}\) ?

If lattice enthalpy and hydration enthalpy of \(\mathrm{KCl}\) are \(699 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(-681.8 \mathrm{~kJ} \mathrm{~mol}^{-1}\) respectively. What is the enthalpy of solution of \(\mathrm{KCl}\) ?

Equal masses in grams of \(\mathrm{H}_2, \mathrm{~N}_2, \mathrm{Cl}_2\), and \(\mathrm{O}_2\), are enclosed in cylinders separately. If these gases expand isothermally and reversibly by \(10 \mathrm{~dm}^3\) at \(300 \mathrm{~K}\), the work...

A gas absorbs \(150 \mathrm{~J}\) heat and expands by \(300 \mathrm{~cm}^3\) against a constant external pressure \(2 \times 10^5 \mathrm{~N} \mathrm{~m}^{-2}\), What is \(\Delta \mathrm{U}\) of the system?

Which among the following is NOT the feature of reversible process?

What is value of PV type of work for following reaction at 1 bar?
$$\underset{(200 \mathrm{~mL})}{\mathrm{C}_2 \mathrm{H}_{4(\mathrm{~g})}}+\underset{(150 \mathrm{~mL})}{\mathrm{HCl}_{(\mathrm{g})}} \longrightarrow \mathrm{C}_2 \mathrm{H}_5...

Which among the following is TRUE for isobaric process?

What is the value of increase in internal energy when system does \(8 \mathrm{~J}\) of work on surrounding by supplying \(40 \mathrm{~J}\) of heat to it?

Identify the type of system if boiling water is kept in a half filled closed vessel.

What is the work done during oxidation of 4 moles of \(\mathrm{SO}_{2(\mathrm{~g})}\) to \(\mathrm{SO}_{3(\mathrm{~g})}\) at \(27^{\circ} \mathrm{C}\)?
$$\left(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1(\mathrm{~g})} \mathrm{mol}^{-1}\rig...

Calculate \(\Delta \mathrm{S}_{\text {total }}\) for the following reaction at \(300 \mathrm{~K}\).
\(\mathrm{NH}_4 \mathrm{NO}_{3(\mathrm{~s})} \longrightarrow \mathrm{NH}_{(\mathrm{aq})}^{+}+\mathrm{NO}_{3(\mathrm{aq})}^{-}\)
$$\left(\Del...

Calculate the final volume when 2 moles of an ideal gas expand from \(3 \mathrm{~dm}^3\) at constant external pressure 1.6 bar and the work done in the process is \(800 \mathrm{~J}\).

What is change in internal energy when system releases \(8 \mathrm{~kJ}\) of heat and performs \(660 \mathrm{~J}\) of work on the surrounding?

The difference between \(\Delta \mathrm{H}\) and \(\Delta \mathrm{U}\) is usually significant for systems consisting of :

If \(8.84 \mathrm{~kJ}\) heat is liberated for formation of \(3 \mathrm{~g}\) ethane, calculate its \(\triangle_{\mathrm{f}} \mathrm{H}^{\circ}\).

Which among the following pair of properties is intensive?

A gas absorbs \(200 \mathrm{~J}\) heat and expands by \(500 \mathrm{~cm}^3\) against a constant external pressure \(2 \times 10^5 \mathrm{~N} \mathrm{~m}^{-2}\). What is the change in internal energy?

What is the heat of formation of \(\mathrm{HCl}_{(\mathrm{g})}\) from following equation?
\(\mathrm{H}_{2(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{g})} \rightarrow 2 \mathrm{HCl}_{(\mathrm{g})} \Delta_{\mathrm{f}} \mathrm{H}=-194 \mathrm{~kJ}\)

Calculate the work done when 2 moles of an ideal gas expand from a volume of \(5 \mathrm{~dm}^3\) to \(7 \times 10^{-3} \mathrm{~m}^3\) against a constant external pressure of \(2.02 \times 10^5 \mathrm{~Nm}^{-2}\) ?

If \(\mathrm{Q}\) is the heat liberated from the system and \(\mathrm{W}\) is the work done on the system then first law of thermodynamics can be written as,

What is the value of temperature in degree Celsius at absolute zero ?

In a process, a system performs \(238 \mathrm{~J}\) of work on it's surrounding by absorbing \(54 \mathrm{~J}\) of heat. What is the change in internal energy of system during this operation?

A gas is allowed to expand against a constant external pressure of 2.5 bar from an initial volume 'x' L to final volume of 4.5 L. If amount of work done is 5 dm\(^3\) bar, what is the value of 'x'?

When \(\mathrm{x} \mathrm{kJ}\) heat is provided to a system, work equivalent to \(\mathrm{y} \mathrm{J}\) is done on it. What is internal energy change during this operation?

What is internal energy change when \(62 \mathrm{~J}\) of work is done on the system and \(128 \mathrm{~J}\) of heat is transferred to surrounding?

When certain volume of gas expands against a constant external pressure of \(2.40 \times 10^5 \mathrm{~Pa}\) at 300 \(\mathrm{K}\) to \(2.2 \times 10^{-3} \mathrm{~m}^3\). If the work obtained is \(-0.048 \mathrm{~kJ}\). What is the initial...

For isochoric process, the first law of thermodynamics can be expressed as

A system does 394 J of work on surrounding by absorbing 701 J heat. What is the change in internal energy of the system?

A system gives out \(\mathrm{x} \mathrm{~J}\) of heat and does \(\mathrm{y} \mathrm{~J}\) of work on it's surrounding. What is the internal energy change?

During a process, system absorbs \(710 \mathrm{~J}\) of heat and increases the internal energy by \(460 \mathrm{~J}\). What is the work performed by system?

Which among the following is NOT an intensive property?

What is the constant external pressure of an ideal gas when expanded from \(2 \times 10^{-2} \mathrm{~m}^3\) to \(3 \times 10^{-2} \mathrm{~m}^3\), if the work done by the gas is \(-5.09 \mathrm{~kJ}\) ?

1 mole of an ideal gas expands isothermally and reversibly by decreasing pressure form \(210 \mathrm{~kPa}\) to \(105 \mathrm{~kPa}\) at \(300 \mathrm{~K}\). What is the work done? $$\left(\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1...

The expansion of gas having no opposing force is called as

Enthalpy of formation of methane is \(-\)75 kJ/mol. What is the enthalpy change for formation of 24 g of methane?

Formation of \(\mathrm{NO}_{2(\mathrm{g})}\) from \(\mathrm{N}_{2(\mathrm{g})}\) and \(\mathrm{O}_{2(\mathrm{g})}\) is an endothermic process. Which of the following is true for this reaction?

What is enthalpy of formation of \(\mathrm{NH}_3\) if bond enthalpies are as \((\mathrm{N} \equiv \mathrm{N})=941 \mathrm{~kJ},(\mathrm{H}-\mathrm{H})=436 \mathrm{~kJ},(\mathrm{N}-\mathrm{H})=389 \mathrm{~kJ}\) ?

What is the difference between \(\Delta H\) and \(\Delta \mathrm{U}\) for reaction given below at \(298 \mathrm{~K}\) ?
(\(\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}\)
$$2 \mathrm{C}_6 \mathrm{H}_{6(\ell)}+15 \mathrm{O}_{2(\mathrm...

What is the work done when a gas is compressed from 2.5 \(\times\) 10\(^{-2}\) m\(^3\) to 1.3 \(\times\) 10\(^{-2}\) m\(^3\) at constant external pressure of 4.05 bar?

A gas is allowed to expand in an insulated container against a constant external pressure of 2.5 atm from \(2.5 \mathrm{~L}\) to \(4.5 \mathrm{~L}\), the change in internal energy of the gas in joules is

Which among the following is NOT an extensive property?