Which process has maximum work done?

Important Questions on Chemical Thermodynamics

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

When 2 litre of ideal gas expands isothermally into vacuum to a total volume of $6$ litre, the change in internal energy is _____ J. (Nearest integer)

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

Write the conditions for maximum work done by the system.

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

If $92 \mathrm{g} \mathrm{Na}$ reacts with water in open vessel at $300 \mathrm{K}$. What is the value of work done? [Assume ideal nature of the gaseous product]

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

Calculation the maximum work done in expanding $16 \mathrm{g}$of oxygen at $300 \mathrm{K}$ and occupying a volume of $5 {\mathrm{dm}}^3$ isothermally until volume becomes $25 {\mathrm{dm}}^3$.

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

Five moles of an ideal gas at $1$ bar and $298 \mathrm{K}$ is expanded into vacuum to double the volume. The work done is :

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

Calculate the work done during compression of $2$ mol of an ideal gas from a volume of $1{\mathrm{m}}^3$ to $10$ ${\mathrm{dm}}^3$ at $300 \mathrm{K}$ against a pressure of $100 \mathrm{kPa}$.

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

Match the following

(A)	Isothermal process	(i)	$\mathrm{q}=∆\mathrm{U}$
(B)	Adiabatic process	(ii)	$\mathrm{W}=-\mathrm{P}\times \mathrm{\Delta V}$
(C)	Isobaric process	(iii)	$\mathrm{W}=∆\mathrm{U}$
(D)	Isochoric process	(iv)	$\mathrm{W}=-\mathrm{nRTln}\left(\frac{{\mathrm{V}}_{\mathrm{f}}}{{\mathrm{V}}_{\mathrm{i}}}\right)$

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

A gas can expand from $100 \mathrm{mL}$ to $250 \mathrm{mL}$ under a constant pressure of $2 \mathrm{atm}$. The work done by gas is

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

The correct option for free expansion of an ideal gas under adiabatic condition is

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

An ideal gas is allowed to expand from $1\mathrm{ }\mathrm{L}$ to $10\mathrm{ }\mathrm{L}$ against a constant external pressure of $1$ bar. The work done in $\mathrm{k}\mathrm{J}$ is:

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

A gas is allowed to expand in a well-insulated container against a constant external pressure of$2.5 \mathrm{atm}$ from an initial volume of $2.50 \mathrm{L}$ to a final volume of $4.50 \mathrm{L}.$ The change in internal energy $\mathrm{\Delta U}$ of the gas in joules will be

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

Temperature of 5 moles of a gas is decreased by 2 K at constant pressure. Indicate the correct statement.

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

1 mole of gas occupying 3L volume is expanded against a constant external pressure of 1 atm to a volume of 15 L. The work done by a system is equal to

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

The given figure shows a change of state $\mathrm{A}$ to state $\mathrm{C}$ by two paths $\mathrm{ABC} \& \mathrm{AC}$ for an ideal gas



The path along which work done is maximum which

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

The work done during the expansion of a gas from a volume of $4\mathrm{ }\mathrm{d}{\mathrm{m}}^3\mathrm{ }\mathrm{t}\mathrm{o}\mathrm{ }6\mathrm{ }\mathrm{d}{\mathrm{m}}^3$ against a constant external pressure of 3 atm is $\left(1\mathrm{ }\mathrm{L}\mathrm{ }\mathrm{a}\mathrm{t}\mathrm{m}=101.32\mathrm{ }\mathrm{J}\right)$

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

The work done by a weightless piston in causing an expansion $\mathrm{\Delta }\mathrm{V}$ (at constant temperature), when the opposing pressure, P is variable, is given by:

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

A piston is cleverly designed so that it extracts the maximum amount of work out of a chemical reaction, by matching P_external to the P_internal at all times. This 8cm diameter piston initially holds back 1 mol of gas occupying 1 L, and comes to rest after being pushed out a further 2 L at 25^oC .After exactly half of the work has been done, the piston has travelled out a total of

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

What is the amount of work done during free expansion? (write answer in words).

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

Convert 10 calories of heat into joules. Give answer to the nearest integer value.

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Nature of heat and work

An ideal gas is taken around the cycle ABCA as shown in PV diagram. The net work done during the cycle is equal to