Question

11.2 L of O2 at STP contains the same number of molecules as 24g of another
substance. What could this substance be
(A) Ozone (B) sulfur dioxide (C) carbon dioxide (D) methane
​

Answer 1

Explanation:

11.2 means half mole of O2

and ozone contains half mole in 24g

because number of moles,n = given mass / molecular mass

n=24 / 48 = 1/2

(molecular mass of ozone(O3) is 48)