If 51.1 g of potassium format reacts in a2.50-L vessel, which was initially evacuated, what pressure of hydrogen will be attained when the temperature is finally cooled to25°C? 8-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 L vessel.
KCHO2(s) + KOH(s)→ K2CO3(s) +H2(g)