In a process for producing acetic acid, oxygen gas is bubbled into acetaldehyde containing manganesed (II) acetate (catalyst under pressure at `60^(@)` C .
`2 CH_(3) CHO + O_(2) to 2CH_(3) COOH`
In a laboratory test of this reaction20 g of `CH_(3) CHO` and 10 g of `O_(2)` were put into a reaction vessel .
(a) How many grams of `CH_(3) COOH` can be produced ?
(b) How many grams of the excess reactant remain after the reaction is complete ?

Explanation

`{:(" "(20//40)" "(10//32)" "0 " . . . .initial mole" ),(2 CH_(3)CHO" "+O_(2)" "to " "2 CH_(3) CO OH),( " " 0 " " (0.3125-0.2272)" "0.4545" . . . . final mole" ),(" "=0.0853):}`
(a) `CH_(3) CHO` is the limiting reagent and hence
amount of `CH_(3) C O O H` produced ` = 0 . 4545 xx 60 g` = 27 . 27 g
(b) Amount of `O_(2)" left " = 0 . 853 xx 32 `
= 2 . 73 g