Which of the following compounds has a standa | vedclass

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

Question

(B) The standard molar enthalpy of formation $(\Delta_f H^\circ)$ of an element in its most stable state at $298 \ K$ and $1 \ bar$ pressure is define

Vedclass · Accepted Answer

$Cl_{2(g)}$

Vedclass · Answer

(B) The standard molar enthalpy of formation $(\Delta_f H^\circ)$ of an element in its most stable state at $298 \ K$ and $1 \ bar$ pressure is defined as zero.Among the given options,$Cl_{2(g)}$ is the most stable form of chlorine at $298 \ K$,so its enthalpy of formation is zero.$Br_{2(l)}$ is the most stable form of bromine at $298 \ K$,but the option provided was $Br_{2(l)}$ (liquid),which is correct; however,$Cl_{2(g)}$ is also a standard element in its stable state.$H_2O_{(g)}$ and $CH_{4(g)}$ are compounds,so their enthalpy of formation is not zero.

Which of the following compounds has a standard molar enthalpy of formation equal to zero at $298 \ K$?

Similar Questions

Hess's law is applicable for the determination of heat of

Identify the factor from the following on which the heat of reaction does not depend.

The heat of formation of water is $260 \ kJ$. How much $H_2O$ is decomposed by $130 \ kJ$ of heat (in $mol$)?

Enthalpy of formation of $CO_{(g)}$,$CO_{2(g)}$,$N_2O_{(g)}$ and $N_2O_{4(g)}$ are $-110$,$-393$,$81$,and $9.7 \ kJ \ mol^{-1}$ respectively. Calculate $\Delta_r H$ for the following reaction: $N_2O_{4(g)} + 3 CO_{(g)} \longrightarrow N_2O_{(g)} + 3 CO_{2(g)}$

Which of the following statements is correct about the heat of combustion?

Vedclass Test Series

Exam Paper Generator

Online Exam Module