Question

1.

As an EPA scientist studying catalytic converters and urban smog, you want to find K_c for the following reaction: 2 NO₂ (g) ⇋ N₂(g) + 2 O₂(g) Kc = ??

Use the following data to find the unknown Kc:

1/2 N2 (g) + 1/2 O₂ (g) ⇋ NO (g) K_c = 0.004

2NO₂ (g) ⇋ 2NO (g) + O₂ (g) K_c = 0.069

2. A chemical reaction between X₂ and Y₂ produces XY. All compounds are in a gaseous state. Consider that you have the following mixture of species in your reaction vessel at a given time:

X₂ : 3 molecules

Y₂ : 10 molecules

XY : 38 molecules

Calculate the equilibrium constant for the balanced reaction between one mole of each reagent.

3.

Given the two reactions

1. H₂S⇌HS⁻+H⁺,   K₁ = 8.96×10⁻⁸, and
2. HS⁻⇌S²⁻+H⁺,   K₂ = 2.34×10⁻²⁰,

what is the equilibrium constant K_final for the following reaction?

S²⁻+2H⁺⇌H₂S

Answer 1

Kc= 4312.5