At 800K, `K_p` for the reaction:
`N_2O_4 hArr 2NO_2`
is 700 mm. Calculate the percentage dissociation of `N_2O_4` at equilibrium pressure of 175 mm. At what pressure, the dissociation will be 50%?

Explanation

To solve the problem, we need to calculate the percentage dissociation of \( N_2O_4 \) at an equilibrium pressure of 175 mm and then find the pressure at which the dissociation will be 50%.

### Step-by-Step Solution

**Step 1: Define the reaction and initial conditions.**
The reaction is:
\[
N_2O_4 \rightleftharpoons 2NO_2
...