27.2 g of oxygen gas is fully reacted. What mass (in grams) of chlorine gas is produced?

Answer 1

Assuming that you are referring to the same reaction as in your previous question, we have...

4HCl + O₂ ==> 2H₂O + 2Cl₂

Moles of O₂ used = 27.2 g O₂ x 1 mol/32 g = 0.85 moles O₂

Mass Cl₂ produced = 0.85 moles O₂ x 2 moles Cl₂/1 mole O₂ x 71.0 g Cl₂/mole Cl₂ = 121 g Cl₂ (3 sig figs)