Chapter 5, Problem 5.118QP

Raoul Pictet, the Swiss physicist who first liquefied oxygen, attempted to liquefy hydrogen. He heated potassium formate, KCHO₂, with KOH in a closed 2.50-Lvessel.

${\text{KCHO}}_2(s)+\text{KOH}(s)\to {\text{K}}_2{\text{CO}}_3(s)+{\text{H}}_2(g)$

If 75.0 g of potassium formate reacts in a 2.50-L vessel, which was initially evacuated, what pressure of hydrogen will be attained when the temperature is finally cooled to 25°C? Use the preceding chemical equation and ignore the volume of solid product.