Thermodynamics

$\mathrm{H}_2(\mathrm{~g}) \longrightarrow 2 \mathrm{H}(\mathrm{g})$

Liquid water crystallises to ice

Temperature of ice is raised from 10 K to 115 K

$2 \mathrm{NaHCO}_3$ (s) $\longrightarrow \mathrm{Na}_2 \mathrm{CO}_3$ (s) $+\mathrm{CO}_2$ (g) $+\mathrm{H}_2 \mathrm{O}$ (s)