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)
If 50.0 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 25oC? Use the preceding chemical equation and ignore the volume of solid product.