Question

Equal volumes of two jars contain $HCl$, $N{H}_3$ gases respectively at constant temperature and pressure $P$. When one of the jars is inverted over another jar so that they mix up, the pressure in either of the jars is:

• A. $1$ atm
• B. equal to $P$
• C. becomes zero
• D. $P+P=2P$

Answer 1

Answer: (C)

becomes zero

$N{H}_3\left(g\right)+HCl\left(g\right)⟶N{H}_{4}Cl\left(s\right)$

Since they combine to form solid $N{H}_{3}Cl$, the pressure becomes zero.