(Δ H_ fusion ) of a substance is ' x ' and (Δ H_ vap ) is ' y ', then (Δ H_ sublimation ) will be

Correct answer: A. x+y aligned &Solid fusion Liquid Δ H_ fusion =x & Liquid vaporisation Gas Δ H_ vap =y & Solid sublimation Gas Δ H_ sub & aligned ) So, (Δ H_ sub =Δ H_ fusion +Δ H_ vap · , Δ H_ sub =x+y).

AIIMS 2007

Exam: AIIMS
Year: 2007
Subject: Chemistry
Chapter: Thermodynamics (C)

AIIMS 2007 · Chemistry · Thermodynamics (C)

(Δ H_ fusion ) of a substance is ' x ' and (Δ H_ vap ) is ' y ',...

(\Delta H_{\text{fusion }}) of a substance is '

x

' and (\Delta H_{\text{vap }}) is '

y

', then (\Delta H_{\text{sublimation }}) will be

Options

A $x+y$
B $x-y$
C $x / y$
D $y / x$ .

Correct answer

A. $x+y$

Step-by-step solution

\begin{aligned} &\text{Solid }\stackrel{\text{ fusion }}{\longrightarrow} \text{ Liquid }\qquad \Delta H_{\text{fusion }}=x \\ &\text{ Liquid }\stackrel{\text{ vaporisation }}{\longrightarrow} \text{ Gas } \qquad \Delta H_{\text{vap }}=y \\ &\text{ Solid }\stackrel{\text{ sublimation }}{\longrightarrow} \text{ Gas } \qquad \Delta H_{\text{sub }} \\ & \end{aligned}

) So, (\Delta H_{\text{sub }}=\Delta H_{\text{fusion }}+\Delta H_{\text{vap } \cdot}, \Delta H_{\text{sub }}=x+y).$

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