7. The equilibrium constant expression for 4 NH3(g) + 5 O2(g) + heat 4 NO(g) + 6

Question

7. The equilibrium constant expression for 4 NH3(g) + 5 O2(g) + heat 4 NO(g) + 6 H2O(g) is Keq= [NH3]4 [02]5 B) Kcq = [NO]4 [H2016 D) NO Keq= [NH3]4 [02]5 Keq_ [NH3] [O2] A) 3.6 B) 4.6 C) 3.5 D) 4.4 E) None of these A) H3PO4- H20 8. A solution has an H concentration of 2.5 x104 M. The pH is 9. In the reaction HsPOa + H2O H30' + HPO, , what are a conjugate acid-base pair. D) this is NOT an acid base reaction, there is no conjugate acid-base pair. 10. Which assumption is not part of the kinetic-molecular theory of gases? A) A gas consists of particles that move randomly and rapidly B) The size of gas particles is small compared to the space between the particles. C) Because the space between gas particles is large, gas particles exert no attractive forces on each other. The kinetic energy of gas particles does not change with increasing temperature. When gas particles collide with each other, they rebound and travel in new directions. D) E)

Explanation / Answer

7. 4NH3(g) + 5O2(g) --------> 4NO(g) + 6H2O(g)
     Keq = [NO]^4[H2O]^6/[NH3]^4[O2]^5
A. Keq = [NO]^4[H2O]^6/[NH3]^4[O2]^5
8. [H^+]   = 2.5*10^-4 M
   PH = -log[H^+]
       = -log2.5*10^-4
       = 3.6020
A. 3.6
9. H3PO4 + H2O ------> H3O^+    +       H2PO4^-
   Acid1    Base2      conjugate acid2 conjugate base1
H3PO4 and H2PO4^ are conjugate acid- base pair
C. H3Po4- H2Po4^-
10.Kinetic energy is directley proportinal to absolute temperature.
D. The kinetic energy of gas particles does not change with increasing temperature.

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