A high temperature reaction vessel is charged with 0.5080 mol of iron powder and 42.1 L of oxygen gas at standard temperature at pressure.On heating,the iron and oxygen react according to the balanced reaction below.
4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)
After the reaction vessel is cooled,and assuming the reaction goes to completion,what volume of oxygen remains?

Question

Quizplus · Accepted Answer

Given the balanced reaction 4Fe(s) + 3O2(g) → 2Fe2O3(s), 0.5080 mol of Fe would require (3/4)*0.5080 mol of O2 for complete reaction. At STP, 1 mol of gas occupies 22.4 L, so the required volume of O2 for the reaction is (3/4)*0.5080*22.4 L. Subtracting this from the initial 42.1 L of O2 gives the remaining volume of O2, which is approximately 33.5 L.

A High Temperature Reaction Vessel Is Charged with 0