A bottle of dry ammonia () and a bottle of dry hydrogen chloride () connected through a long uniform — States of Matter and Gaseous State Chemistry Question
Question
A bottle of dry ammonia ($NH_3$) and a bottle of dry hydrogen chloride ($HCl$) connected through a long uniform glass tube are opened simultaneously at both ends. Where will the white ammonium chloride ($NH_4Cl$) ring first be formed?
Answer: B
💡 Solution & Explanation
According to Graham's Law, lighter gases diffuse faster ($r \propto 1/\sqrt{M}$). The molar mass of $NH_3$ ($17\text{ g/mol}$) is less than $HCl$ ($36.5\text{ g/mol}$). Therefore, $NH_3$ travels faster and further down the tube in the same time, making the gases meet closer to the slower-moving $HCl$ source.
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