Chemistry Practice Problems The Reaction Quotient Practice Problems Solution: Given that Kp = 1.39 at 400°C for the reaction, P4...

# Solution: Given that Kp = 1.39 at 400°C for the reaction, P4(g) &lt;=&gt; 2 P2(g), which answer best describes the reaction when 1.50 mol of P4(g) and 1.15 mol of P2(g) are mixed in a 25.0 L, closed container at 400°C? [REMEMBER: it’s Kp] a. Qp = 1.95, the reaction proceeds to the left.b. Qp = 1.95, the reaction proceeds to the right.c. Qp = 0.51, the reaction proceeds to the left.d. Qp = 0.51, the reaction proceeds to the right.e. Qp = 0.77, the reaction proceeds to the left.

###### Problem

Given that Kp = 1.39 at 400°C for the reaction, P4(g) <=> 2 P2(g), which answer best describes the reaction when 1.50 mol of P4(g) and 1.15 mol of P2(g) are mixed in a 25.0 L, closed container at 400°C? [REMEMBER: it’s Kp

a. Qp = 1.95, the reaction proceeds to the left.
b. Qp = 1.95, the reaction proceeds to the right.
c. Qp = 0.51, the reaction proceeds to the left.
d. Qp = 0.51, the reaction proceeds to the right.
e. Qp = 0.77, the reaction proceeds to the left.

###### Solution

We’re being asked to determine what happens to the reaction when 1.50 mol of P4(g) and 1.15 mol of P2(g) are mixed in a 25.0 L closed container at 400 °C.

P4(g) ⇌ 2 P2(g);            Kp = 1.39

We will use the reaction quotient, Q, to determine if a chemical reaction would be at equilibrium or not. The formula for Q is:

$\overline{){\mathbf{Q}}{\mathbf{=}}\frac{\mathbf{products}}{\mathbf{reactants}}}$

Depending on if Q is greater than or less than K our reaction will shift to attain equilibrium by reaching the equilibrium constant K:

If Q = K           → the reaction is at equilibrium
If Q < K           → the reaction shifts in the forward direction to reach equilibrium
If Q > K           → the reaction shifts in the reverse direction to reach equilibrium

Since the Kp is given, we need to calculate the pressure of each gas first using the ideal gas equation:

View Complete Written Solution

The Reaction Quotient

The Reaction Quotient

#### Q. Which of the following statements is not true?A) The products are favored when Q &lt; Keq B) The reactants are favored when Q &gt; Keq C) The reaction...

Solved • Fri Jan 24 2020 13:09:04 GMT-0500 (EST)

The Reaction Quotient

#### Q. The table below lists the equilibrium concentrations for H 2(g), I2(g), and HI(g) in the given reaction.H2 (g) + I2 (g) ⇌ 2HI (g)At 500 K, the gases h...

Solved • Fri Dec 20 2019 15:17:23 GMT-0500 (EST)

The Reaction Quotient

#### Q. Given that Kp = 1.39 at 400 °C for the reaction, P4(g) &lt;=&gt; 2 P2(g), which answer best describes the reaction when 1.50 mol of P4(g) and 1.15 mol...

Solved • Thu Dec 19 2019 11:41:39 GMT-0500 (EST)

The Reaction Quotient

#### Q. Consider the gas-phase reaction, N2(g) + 3 H2(g) &lt;=&gt; 2 NH3 (g), for which Kp = 43 at 400 K. If the mixture is analyzed and found to contain 0.18...

Solved • Mon Dec 16 2019 14:17:44 GMT-0500 (EST)