An open manometer attached to a flask containing ammonia gas have...

An open manometer attached to a flask containing ammonia gas have no difference in mercury level initially as shown in diagram. After sparking into the flask, ammonia is partially dissociated as

2 {NH}_{3} \left(\text{g}\right)⟶ {N}_{2} \left(\text{g}\right) +3 {H}_{2} \left(\text{g}\right)

Now it have difference of \text{18}\text{cm}

in mercury level in two columns, what is partial pressure of

{H}_{2} \left(\text{g}\right)

at equilibrium ?

An open manometer attached to a flask containing ammonia gas have no difference in mercury level initially as shown in

Options

A $\text{9}\text{cm}$ of $\text{Hg}$
B $\text{18 cm}$ of $\text{Hg}$
C $\text{27}\text{cm}$ of $\text{Hg}$
DNone of these

Correct answer

C. $\text{27}\text{cm}$ of $\text{Hg}$

Step-by-step solution

\begin{cases}2 {NH}_{3} \left(\text{g}\right) & ⟶ & {N}_{2} \left(\text{g}\right) & + & 3 {H}_{2} \\ 7 6 - 2 \text{x} & & \text{x} & & 3 \text{x}\end{cases}

7 6 + 2 \text{x} = 7 6 + 1 8

2 \text{x} = 1 8

∴ \text{x} = 9

∴ {p}_{\text{H} 2} = 3 \times 9

= \text{27 cm of Hg}

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