Thermochemistry and Electrochemistry

When the equation for the following reaction in basic solution is balanced, what is the sum of the coefficients?
MnO₂ + HO₂^- -> MnO₄^-

• 18
• 9
• 14
• 11

The following reaction has a ΔG^ₒ value of 48.47 kJ/mol at 25^ₒC.
HB(aq) + H₂O(l) <-> H₃O⁺(aq) + B^-(aq)
Calculate K_a for the acid HB.

• 0.981
• -19.6
• 4.85 x 10^-5
• 3.19 x 10^-9

Given the following in acidic media:
Fe²⁺ + Cr₂O₇^2- -> Fe³⁺ + Cr³⁺
answer the following question: The coefficient for water in the balanced reaction is:

• 5
• 7
• 3
• 1

How many electrons are transferred in the following reaction when it is balanced in acidic solution? SO₃^2-(aq) + MnO₄^-(aq) -> SO₄^2-(aq) + Mn²⁺(aq)

• 10
• 3
• 2
• 6

Which energy conversion shown below takes place in a galvanic cell?

• electrical to chemical
• mechanical to chemical
• mechanical to electrical
• chemical to electrical

The following reactions occurs in basic solution: 
F₂ + H₂O -> O₂ + F^-
When the equation is balanced, the sum of the coefficients is:

• 11
• 13
• 12
• 10

Consider the following numbered processes:
1. A -> 2B
2. B -> C + D
3. E -> 2D
ΔH for the process A -> 2C + E is

• ΔH₁ + ΔH₂ + ΔH₃
• ΔH₁ + ΔH₂ 
• ΔH₁ + ΔH₂ - ΔH₃
• ΔH₁ + 2ΔH₂ - ΔH₃

Consider the following processes:
I.  condensation of a liquid
II. increasing volume of an ideal gas at constant temp
III. dissolving sugar in water
IV. heating 1.0 mol of an ideal gas at constant volume
For how many of these is ΔS positive?

• 0
• 1
• 2
• 3

For the reaction A + B 0> C + D, ΔH^ₒ = +40 kJ and ΔS^ₒ = +50 J/K. Therefore, the reaction under standard conditions is

• spontaneous at temps < 10K
• spontaneous at temps < 800K
• spontaneous at temps between 10K and 800K
• spontaneous at all temperatures

Consider the reaction:
2SO2(g) <-> 2SO3(g)
for which ΔH^ₒ = -200. kJ and ΔS^ₒ =-187.1 J/K. Assuming that ΔH^ₒ and ΔS^ₒ are independent of temperature, calculate the temperature where K_p = 1.

• 969 K
• 2069 K
• 200. K
• 1069 K