chemistry quiz.....

Question

# 1

Write the K_c and K_P for the decomposition of di-nitrogen pentoxide:

 

 

2 N₂O_{5 (g)} ↔4 NO_2(g) + O_2(g)

#2

Consider the following reaction:

 

N_2(g) + O_2(g) ↔ 2NO_(g)

 

If the equilibrium partial pressures of N₂, O₂, and NO are 0.15 atm, 0.33 atm, and 0.050 atm, respectively, at 2200 ^OC , what is K_p?

#3

Identify the acid –base conjugate pairs in each of the following reactions:

A) H₂PO₄^-+ NH₃↔HPO₄^2- + NH₄⁺

 

 

B) HClO + CH₃NH₂↔CH₃NH₃⁺+ ClO^-

 

 

Answer 1

1) 2N₂O_{5 (g)} ==> 4NO_2(g) + O_2(g)

Kc = [NO₂]⁴[O₂] / [N₂O₅]²

Kp = P_(NO2)⁴ x P_(O2) / P_(N2O5)²

2) N_2(g) + O_2(g) ==> 2NO_(g)

Kp = P_(NO)² / P_(N2) x P_(O2)

Kp = (0.050)² / (0.15)(0.33)

Kp = 0.051

3) a) H₂PO₄^-+ NH₃ ==> HPO₄^2- + NH₄⁺

H₂PO₄^- is the acid, and HPO₄^2- is the conjugate base

NH₃ is the base and NH₄⁺ is the conjugate acid

b) HClO + CH₃NH₂ ==> CH₃NH₃⁺+ ClO^-

HClO is the acid and ClO^- is the conjugate base

CH₃NH₂ is the base and CH₃NH₃⁺ is the conjugate acid