Ch. 17. equilibrium      test                                           40 points                      honors chemistry
           
Show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

1. In the reaction:   H2(g)  + F2(g)  →  2 HF(g), the value of Kp is 5.0. Initially, there’s 1.0, 2.0, and 5.0 atm of H2, F2, and HF, respectively.  Find the equilibrium partial pressure of HF.  [10 points]

2. In the reaction:   H2(g)  + Cl2(g)  →  2 HCl(g), the value of Kc is 10. Initially, there’s 1.0, 2.0, and 5.0 M of H2, Cl2, and HCl, respectively, and the equilibrium [H2] is 0.3 M;  what’s the value of the Kc.  [10 points]

3.  In regards to the reaction:  C2H6(g)  +  O2(g)  →  CO2(g)  +  H2O(g) at equilibrium is disturbed by ___; what is the effect on the number of moles of O2 after the disturbance; rationalize your response.  [10 points]

a.  Addition of neon, an inert gas, at constant temperature and pressure

b.  Cooling the system

4. Would mixing 15 mL 25 μM silver nitrate and 25 mL 0.15 mM sodium chloride form a precipitate ?  justify your answer.  [10 points]