Acetylene gas (c2h2) used in welding, pro- duces an extremely hot flame when it burns in pure oxygen according to the reaction
2 c2h2(g)+5 o2(g) −→ 4 co2(g)+2 h2o(g) .
how much co2 is produced when 2 g of c2h2 burns completely?

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?