The chemical equation for the combustion of acetylene open paren cap c sub 2 cap h sub 2 close paren is given. 2 cap c sub 2 cap h sub 2 g plus 5 cap o sub 2 g rightarrow 4 CO sub 2 g plus 2 cap h sub 2 cap o g What volume of oxygen at STP is required for the complete combustion of 100 point 5 0 milliliters of cap c sub 2 cap h sub 2 ?