CHEM 1050 Lecture Notes - Lecture 12: Joule, Boiling Point, Reaction Rate Constant

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Review questions products are not favour so not negative value. Multiple choice questions: at 298k, keq = 4. 34 10, 17. 6 kj. 5 for the reaction: ph3(g) + hi(g) ph4i(s). Go= -237. 2 kj/mol temp changes, liquid and gas reached equilibrium: the boiling point of ch3cooh(l) can be calculated to be, 153 c, 0. 426 c. Wstch units: 799 c, 153 c, the oxidation state of p in na2hpo4 is, 1. Na= +1 h=+1 o= -2: +5, +3, given zn(s) + sn2+ (aq) sn(s) + zn2+ (aq) 9: 2. 5 104 (aq) + br (aq) + hobr(aq) at 298k is, 4. 1 10. 4: a current is passed through a molten mixture of zni2 and kcl. The product at the cathode is: cl, i2, zn, k, use the following experimental data for no(g) + cl2(g) nocl2(g) molten= no water. The order of cl2(g) in the rate law is: 1, none of these x2.

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1. Calculate the standard change in free energy ?G? (kJ) at 298 K for the reaction C2H4(G)+3o2(G) --> 2CO2(G)+2H2O(G)

a -1310 b. +1180 c. -691 d. +1310 e. -1180

2. The value of E?cell for the reaction 2Cr3+(aq)+6Hg(l) --> 2Cr(s)+3Hg22+(aq) is 1.59 V. Calculate the ?G? (kJ) for the reaction.

a. -921 b. -153 c. -767 d. -460 e. -307

3. What is the value of the equilibrium constant for the cell reaction below at 25 deg C? E?cellÂ=0.61V 2Cr(s)+3Pb2+(aq) <---> 3Pb(s)+2Cr3+(aq)

a. 8.2*10^30 b. 6.7*10^61 c. 9.9*10^99 d. 4.1*10^20 e. 3.3*10^51

4. Which one of the following is not a redox reaction?

a. Na6FeCl8(s)+2Na(l) ---> 8NaCl(s)+Fe(s)

b. Al(OH)3 (aq)+3H+ ---> Al3+(aq)+3H2O(l)

c. CuCl2(aq)+Ni(s) ---> Cu(s)+NiCl2(aq)

d. C6H12O6(s)+6O2(g) ---> 6CO2+6H2O(l)

e. COÂ2(g)+H2(g) ---> CO(g)+ H2O(g)ÂÂÂÂÂÂÂÂ

5. A voltaic cell consists of a Zn/ZN2+ electrode and a Fe/Fe2+ electrode. If [ZN2+] = 0.005M and if [Fe2+] = .0500 M , what is Ecell?

a. .76 b. 0.25 c. 0.45 d. 0.31 e. 0.37

6. The formation constant for the reaction Ag+ (aq)+2NH3(aq) <----> Ag(NH3)2+(aq) is K=1.7*107 at 25 deg C. What is the ?G?(kJ/mol) at this temperature?

a. -23 b. -18 c. -3.5 d. -1.5 e. -41

7. Nitric oxide reacts with chlorine to form NOCL. What is the free energy (kJ) of the reaction at 277 deg C?

a. +144 b.. -41.0 c. -10.3 d. -22.2 e. +41.0

8. Estimate the boiling point (deg C) of phosphoric Acid.

H3PO4(s) <----> HÂ3PO4(l)

?H?f kJ/mol -1279 - -127.17

?G?f kJ/mol -1119 - 1123.6

?S?f J/(k mol) 110.5 - 150.8

a. 42 b. 181 c. 315 d. -92 e. 305

9. Calculate the equilibrium constant, K, for the following reaction at 25?C:

CH4(g)+2H2O(g) <---> Ã CO2(g)+4H2(g) ?G?= -113.6 kJ (please show ICE chart and explain process)

a. 8.2x1019 b. 0.58 c. 0.96 d. 1.4x10-46 e. 1.2x10-20

10. Which of the following results in a decrease in the entropy of the system?

a. O2(g), 300K --> O2(g), 400K b. H2O(s) --> H2O(l) c. N2(g) --> N2(aq) d. NH3(l) --> NH3(g)

e. 2H2O2(g) ---> 2H2O(g)+O2(g)

CHEM 1050 Lecture Notes - Lecture 12: Joule, Boiling Point, Reaction Rate Constant

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