Which of the following reactions defines Delt | vedclass

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

Question

(A) The standard enthalpy of formation,denoted as $\Delta H_f^o$,is defined as the enthalpy change that occurs when $1 \ mole$ of a substance is forme

Vedclass · Accepted Answer

$\frac{1}{2} H_{2(g)} + \frac{1}{2} F_{2(g)} 	o HF_{(g)}$

Vedclass · Answer

(A) The standard enthalpy of formation,denoted as $\Delta H_f^o$,is defined as the enthalpy change that occurs when $1 \ mole$ of a substance is formed from its constituent elements in their most stable standard states.In option $(A)$,$1 \ mole$ of $HF_{(g)}$ is formed from its elements $H_{2(g)}$ and $F_{2(g)}$ in their standard states,which fits the definition.In option $(B)$,$CO$ is a compound,not an element.In option $(C)$,carbon is in the diamond state,which is not the standard state (graphite is).In option $(D)$,$2 \ moles$ of $NH_3$ are formed,not $1 \ mole$.

Which of the following reactions defines $\Delta H_f^o$?

Similar Questions

$A$ body is projected with a speed $u \ m/s$ at an angle $\beta$ with the horizontal. The kinetic energy at the highest point is $\frac{3}{4}$ of the initial kinetic energy. The value of $\beta$ is $....^{\circ}$

If $2 \vec{a} + 3 \vec{b} + \vec{c} = \vec{0}$,then $\vec{a} \times \vec{b} + \vec{b} \times \vec{c} + \vec{c} \times \vec{a}$ is equal to

The secretion from the abdominal glands of honey bees is ..........

Which of the following concentration factors is affected by a change in temperature?

Vedclass Test Series

Exam Paper Generator

Online Exam Module