Can anybody answer this chemistry question? At 2000°C the equilibrium constant for the reaction is Kc = 2.4 ✕ 103.?

2017-05-10 12:06 am

2 NO(g) equilibrium reaction arrow N2(g) + O2(g)
If the initial concentration of NO is 0.140 M, what are the equilibrium concentrations of NO, N2, and O2?

回答 (1)

胡雪8°

2017-05-10 12:40 am

___________ 2NO(g) ___ ⇌ ___ N₂(g) ___ + ___ O₂(g) _____Kc = 2.4 × 10³
Initial: ______0.140 M _________ 0 M _________ 0 M
Change: _____ -2y M _________ +y M _________ +y M
At eqm: ___ (0.140 - 2y) M ______ y M _________ y M

Kc = [N₂] [O₂] / [NO]²
2.4 × 10³ = y² / (0.140 - 2y)²
y / (0.140 - 2y) = √(2.4 × 10³)
0.02041y = 0.140 - 2y
2.02041y = 0.140
y = 0.693
At equilibrium, [N₂] = [O₂] = 0.693 M

Kc = [N₂] [O₂] / [NO]²
2.4 × 10³ = 0.693² / [NO]²
[NO]² = 0.693² / (2.4 × 10³)
At equilibrium, [NO] = 0.693 / √(2.4 × 10³) M = 0.0142 M

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