Calculate the volume of `O_(2)` at STP required to completely burn 100 ml. of acetylene.

Explanation

Balanced chemical equation for combustion of acetylene is
`2C_(2)H_(2)+5O_(2)to 4CO_(2)+ 2H_(2)O`
2 moles of `C_(2)H_(2)` require 5 moles of `O_(2)` for complete combustion at STP
2 xx 22400 ml of `C_(2)``H_(2)` require 5 xx 22400 ml of `O_(2)` at STP
Then 100 ml of `C_(2)H_(2)` require ____ ?
`(100 x x5 xx 22400)/(2 xx 22400)=(500)/(2)=250` " ml"