#
**Problem**: Ammonium iodide can dissociate to produce HI and ammonia, NH4I(s) ⇌ NH3(g) + HI(g). At 300 °C, Kp = 0.42. If 250. g of ammonium iodide is placed into a 3.00 L flask and heated to 300 °C, what is the partial pressure of ammonia at equilibrium?a. 0.84 atm b. 0.21 atmc. 0.42 atmd. 0.65 atme. 0.18 atm

###### FREE Expert Solution

We’re being asked to **determine the partial pressure of Ammonia when 250 g of NH4I is placed in a 3 L flasked heated up to 300°C**

NH_{4}I(s) ⇋ NH_{3}(g) + HI(g)

Recall that the ** equilibrium constant** is the ratio of the products and reactants. We use

**K**when dealing with pressure and

_{p}**K**when dealing with concentration:

_{c}$\overline{){{\mathbf{K}}}_{{\mathbf{p}}}{\mathbf{=}}\frac{{\mathbf{P}}_{\mathbf{products}}}{{\mathbf{P}}_{\mathbf{reactants}}}}$ $\overline{){{\mathbf{K}}}_{{\mathbf{c}}}{\mathbf{=}}\frac{\mathbf{\left[}\mathbf{products}\mathbf{\right]}}{\mathbf{\left[}\mathbf{reactants}\mathbf{\right]}}}$

Note that __solid and liquid compounds are ignored in the equilibrium expression.__

###### Problem Details

Ammonium iodide can dissociate to produce HI and ammonia, NH_{4}I(s) ⇌ NH_{3}(g) + HI(g). At 300 °C, K_{p} = 0.42. If 250. g of ammonium iodide is placed into a 3.00 L flask and heated to 300 °C, what is the partial pressure of ammonia at equilibrium?

a. 0.84 atm

b. 0.21 atm

c. 0.42 atm

d. 0.65 atm

e. 0.18 atm

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Equilibrium Expressions concept. If you need more Equilibrium Expressions practice, you can also practice Equilibrium Expressions practice problems .

What is the difficulty of this problem?

Our tutors rated the difficulty of
*
Ammonium iodide can dissociate to produce HI and ammonia, NH...
*
as medium difficulty.