Chemistry, 09.10.2019 05:00 katiedurden02

Phosgene is a potent chemical warfare agent that is now outlawed by international agreement. it decomposes by the reaction: cocl2 (g) ⇋ co (g) + cl2 (g) kc = 7.5 x 10-5 (at 362°c) calculate the concentration of co when 7.73 mol of phosgene decomposes and reaches equilibrium in a 10.0 liter flask. multiply your answer by 103 and enter that number to 2 decimal places. hint: look at sample problem 17.9 in the 8th ed of silberberg. write a kc expression. calculate the initial concentration of phosgene. do an ice chart. find the concentration of co.

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Answer from: michibabiee

[CO] = 7.61x10⁻³M

7.61x10⁻³x10³ = 7.61

Explanation:

For a generic equation aA + bB ⇄ cC + dD, the constant of equilibrium (Kc) is:

$Kc = \frac{[C]^cx[D]^d}{[A]^ax[B]^b}$

We need to know the molar concentrations in the equilibrium. In the beginning, there is only COCl₂, and its concentration is the number of moles divided by the volume:

[COCl₂] = 7.73/10.0 = 0.773 M

So, the equilibrium will be:

COCl₂(g) ⇆ CO(g) + Cl₂(g)

0.773 0 0 Initial

-x +x +x Reacts

0.773-x x x Equilibrium

Supposing that x<<0.773, then:

$Kc = \frac{x*x}{0.773}$

7.5x10⁻⁵ = x²/0.773

x² = 5.7975x10⁻⁵

x = √5.7975x10⁻⁵

x = 7.61x10⁻³ M

The supposing is correct, so [CO] = 7.61x10⁻³ x 10³ = 7.61

Answer from: Quest

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Answer from: Quest

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

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Phosgene is a potent chemical warfare agent that is now outlawed by international agreement. it deco...