List of top Chemistry Questions on Work done in Thermodynamics

Which of the following is true for entropy?

In an isothermal expansion of an ideal gas, the heat supplied to the gas is:

The standard enthalpies of formation of $\mathrm{CH_4(g)}$, $\mathrm{CO_2(g)}$ and $\mathrm{H_2O(l)}$ are $-78$, $-395$ and $-288\ \mathrm{kJ\ mol^{-1}}$ respectively. Calculate $\Delta H$ for: \[ \mathrm{2CH_4(g) + 4O_2(g) \rightarrow 2CO_2(g) + 4H_2O(l)} \] }

Find the work done by a gas that expands from \(0.2\,\text{dm}^3\) to \(0.8\,\text{dm}^3\) against a constant pressure of \(2\) bar.

Which of the following is not a property of a thermodynamic system?

The mathematical statement of the first law of thermodynamics with the usual notation is

1 g of graphite is burnt completely in excess oxygen at 298K and 1 atmospheric pressure in a bomb calorimeter. During the reaction, the temperature raises from 298K to 299K. If the heat capacity of the bomb calorimeter is 20.7 kJ K\(^{-1}\), what is the enthalpy of combustion of C(gr)? (Atomic mass of carbon is 12 g mol\(^{-1}\))

In a free expansion of a gas

The first law of thermodynamics can be stated as

For the reaction CO(g) + \(\frac{1}{2}\) O\(_2\)(g) \(\rightarrow\) CO\(_2\)(g) Which one of the statement is correct at constant T and P?

\( \Delta G \) for \( 3\text{X}_{(g)} + 2\text{Y}_{(g)} \rightarrow 3\text{Z}_{(g)} \) at 293 K is
( \( \Delta H^\circ = -13\,\text{kJ mol}^{-1} \), \( \Delta S^\circ = -45\,\text{J mol}^{-1}\text{K}^{-1} \) )

For a certain reaction $\Delta H = -225$ kJ and $\Delta S = -150$ J K$^{-1}$. Find the temperature so that $\Delta G$ is zero.

Which from following is an example of an intensive property of the system?

Calculate the work done in the oxidation of one mole $HCl_{(g)}$ at 27$^\circ$C, according to reaction.
$4HCl_{(g)} + O_{2(g)} \rightarrow 2Cl_{2(g)} + 2H_2O_{(g)}$
(R = 8.314 J K$^{-1}$ mol$^{-1}$)

Calculate the constant external pressure required to expand 2 moles of an ideal gas from volume $15\text{dm}^3$ to $20\text{dm}^3$ if amount of work done is -600 J .

Calculate the work done in joule if 2 moles of an ideal gas expand isothermally from \(15.5 \text{ dm}^3\) to \(20 \text{ dm}^3\) at constant pressure 1 atm .

Given: $\Delta_r H^{+}(\text{Ag}^+)=105.6\ \text{kJ mol}^{-1}$, $\Delta_r H^{+}(\text{Cl}^-)=-167.2\ \text{kJ mol}^{-1}$, and $\Delta_r H^{+}(\text{AgCl})=-127.1\ \text{kJ mol}^{-1}$, find the value of $\Delta_r H$.

Types of system and their definitions are given below. Choose the correct match from the following codes:
System:
(a) Closed system
(b) Open system
(c) Isolated system
(d) Homogeneous system
(e) Heterogeneous system
Definition:
(i) A system which can exchange both energy and matter with surrounding
(ii) A system which cannot exchange matter or energy with surrounding
(iii) A system consisting of single phase
(iv) A system consisting of many phases
(v) A system which can exchange only energy with surrounding

For a certain reaction $\Delta H = -225$ kJ and $\Delta S = -150$ J K$^{-1}$. Find the temperature so that $\Delta G$ is zero.

Which from following is an example of an intensive property of the system?

Calculate the work done in the oxidation of one mole $HCl_{(g)}$ at 27$^\circ$C, according to reaction.
$4HCl_{(g)} + O_{2(g)} \rightarrow 2Cl_{2(g)} + 2H_2O_{(g)}$
(R = 8.314 J K$^{-1}$ mol$^{-1}$)

The enthalpy of combustion values of $C_{2}H_{4(g)}$, $C_{(graphite,s)}$ and $H_{2(g)}$ are respectively $-1411\ \text{kJ mol}^{-1}$, $-394\ \text{kJ mol}^{-1}$ and $-286\ \text{kJ mol}^{-1}$. What is the enthalpy of formation of $C_{2}H_{4(g)}$ in $\text{kJ mol}^{-1}$?

In which of the following reactions does entropy decrease? (i) $2Pb(NO_{3})_{2(s)}\rightarrow 2PbO_{(s)}+4NO_{2(g)}+O_{2(g)}$ (ii) $H_{2}O_{(g)}\rightarrow H_{2}O_{(l)}$ (iii) $Br_{2(l)}\rightarrow 2Br_{(g)}$ (iv) $C_{6}H_{6(l)}\rightarrow C_{6}H_{6(s)}$

In the reaction \( \frac{3}{2}O_2(g) \rightarrow O_3(g) \), the value of \( \Delta_r G^\circ \) at \( 298\,K \) is approximately ( \( K_p = 10^{-30},\ 2.303RT = 5.7\,\text{kJ mol}^{-1} \) )

Consider the following thermodynamic properties of a system: (i) Volume (ii) Pressure (iii) Density (iv) Heat capacity. The extensive property/properties of the system is/are