Chemistry - Thermochemistry Question with Solution | TestHub

$\begin{array}{rl}& \text{Solid }\stackrel{\text{ fusion }}{⟶}\text{ Liquid }\Delta H_{\text{fusion }}=x\\ & \text{ Liquid }\stackrel{\text{ vaporisation }}{⟶}\text{ Gas }\Delta H_{\text{vap }}=y\\ & \text{ Solid }\stackrel{\text{ sublimation }}{⟶}\text{ Gas }\Delta H_{\text{sub }}\\ & \end{array}$ So, $\Delta H_{\text{sub }}=\Delta H_{\text{fusion }}+\Delta H_{\text{vap }\cdot },\Delta H_{\text{sub }}=x+y$.