Assertion : For a reaction 2NH_{3(g)} to N_{2 | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The relationship between enthalpy change $(\Delta H)$ and internal energy change $(\Delta E)$ is given by the equation $\Delta H = \Delta E + \Del

Vedclass · Accepted Answer

If the Assertion is correct but Reason is incorrect.

Vedclass · Answer

(C) The relationship between enthalpy change $(\Delta H)$ and internal energy change $(\Delta E)$ is given by the equation $\Delta H = \Delta E + \Delta n_g RT$.For the reaction $2NH_{3(g)} 	o N_{2(g)} + 3H_{2(g)}$,the change in the number of gaseous moles is $\Delta n_g = (1 + 3) - 2 = +2$.Since $\Delta n_g$ is positive,$\Delta H = \Delta E + 2RT$,which implies $\Delta H > \Delta E$. Thus,the Assertion is correct.However,the Reason states that enthalpy change is always greater than internal energy change,which is false because if $\Delta n_g$ is negative (e.g.,$N_{2(g)} + 3H_{2(g)} 	o 2NH_{3(g)}$),then $\Delta H < \Delta E$.

Assertion : For a reaction $2NH_{3(g)} \to N_{2(g)} + 3H_{2(g)}$ ; $\Delta H > \Delta E$
Reason : Enthalpy change is always greater than internal energy change.

Similar Questions

If $f:[-6,6] \rightarrow R$ is defined by $f(x)=x^2-3$ for $x \in R$,then $(f \circ f \circ f)(-1)+(f \circ f \circ f)(0)+(f \circ f \circ f)(1)$ is equal to

Identify the incorrect statement among the following:

$A$ particle starts from a point $P$ at a distance of $A/2$ from the mean position $O$ and travels towards the left as shown in the figure. If the time period of $SHM$ executed about $O$ is $T$ and the amplitude is $A$,then the equation of motion of the particle is:

Two photons of energy $2.5 \ eV$ and $3.5 \ eV$ fall on a metal surface of work function $1.5 \ eV$. The ratio of the maximum velocities of the photoelectrons emitted from the metal surface is

In the electrolytic extraction of $Al$,molten cryolite $(Na_3AlF_6)$ is used because it .......

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion : For a reaction $2NH_{3(g)} \to N_{2(g)} + 3H_{2(g)}$ ; $\Delta H > \Delta E$ Reason : Enthalpy change is always greater than internal energy change.