Question

Which of the following contains maximum number of molecules ?

• A. 100 cc of $CO_2$ at S.T.P
• B. 150 cc of $N_2$ at S.T.P
• C. 50 cc of $SO_2$ at S.T.P
• D. 150 cc of $O_2$ at S.T.P
• E. 200 cc of $NH_3$ at S.T.P

Answer 1

Answer: (E)

Equal volume of all gases, under similar conditions of temperature and pressure contains equal number of molecules (Avagadro’s Law)
$\therefore 200\,cc$ of $NH_{3}$ at $S.T.P.$ contains maximum number of molecules