what volume of F2 gas reacts completely with Cl2 gas to produce 2 L of ClF5?

Question

at stp, 1.0 L of Cl2(g) reacts completely with a volume of F2(g) to produce 2.0 L of ClF5. what volume of F2(g) reacted completely?

Answer 1

5F₂(g) + Cl₂(g) ==> 2ClF₅

Note the stoichiometric ratio showing that 1 mole Cl₂ reacts with 5 mole F₂ to produce 2 mole ClF₅.

So, 2.0 liters of ClF₅ requires 5 liters of F₂.