Q. 10 mL of oxygen and 10 mL of hydrogen is kept at the same temperature and pressure, which is correct about number of molecules?
A) $No_{2} > N_{H_{2}}$
B) $No_{2} < N_{H_{2}}$
C) $No_{2} = 16N_{H_{2}}$
D) $No_{2} = N_{H_{2}}$
Explanation
(d)
From ideal gas equation,
$pV = nRT$
Since, $p,V\ and\ T$ are same for both $O_{2}\ and\ H_{2},$ therefore their number of moles$(n)$ are also equal. Hence, number of molecules will be equal for $O_{2}\ and\ H_{2}.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.