Problem: The equation for the formation of hydrogen iodide from H 2 and I2 is:H2(g) + I2(g) ⇌ 2HI(g)The value of Kp for the reaction is 71 at 710.0 °C. What is the equilibrium partial pressure of HI in a sealed reaction vessel at 710.0 °C if the initial partial pressures of H2 and I2 are both 0.100 atm and initially there is no HI present?

FREE Expert Solution
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FREE Expert Solution

We are being asked to calculate the partial pressure of HI at equilibrium:

H2(g) + I2(g) ⇌ 2 HI(g)      Kp = 71


When dealing with equilibrium and Kp:

Kp → equilibrium units are in pressure units 
Kp is an equilibrium expression:

Kp=productsreactants

only aqueous and gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression

We're going to calculate the final partial pressure of HI using the following steps:


86% (62 ratings)
Problem Details

The equation for the formation of hydrogen iodide from H 2 and I2 is:

H2(g) + I2(g) ⇌ 2HI(g)

The value of Kp for the reaction is 71 at 710.0 °C. What is the equilibrium partial pressure of HI in a sealed reaction vessel at 710.0 °C if the initial partial pressures of H2 and I2 are both 0.100 atm and initially there is no HI present?

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