Question 3 A galvanic cell at a temperature of 25.0°C is powered by the following redox reaction: →+2VO+2aq+4H+aqFes+2VO+2aq+2H2OlFe+ 2aq Suppose the cell is prepared with 2.22 M VO+2 and 3.55 M H+ in one half-cell and 5.56 M VO+2 and 6.55 M Fe+2 in the other. Calculate the cell voltage under these conditions. Round your answer to 3 significant digits.

E = +1.430  V

Explanation:

The given cell reaction is written as:

2VO²⁺(aq) + 4H⁺(aq) + Fe(s)---> 2VO₂⁺(aq) + 2H₂O(l) + Fe²⁺(aq)

E⁰cell = E⁰_{VO₂/Vo₂⁺}  - E⁰_{Fe²⁺/Fe}

= + 1.00 - ( - 0.447) = + 1.45 V

From Nernst equation...

E = E⁰cell - (RT/nF) lnQ

where, Q = [products]/[reactants]

= [Fe²⁺][VO₂⁺]²/[VO²⁺]²[H⁺]⁴

Q= (6.55*5.56)/(2.22*3.55)

 = 36.418/7.881

 = 4.621

T = 25 + 273 = 298K

at 298K the above equation could also be written as...

E = E⁰cell - (0.0592/n) log Q

n is number of electrons transferred and it is 2. Let's plug in the values...

E = 1.45 - (0.0592/2) log 4.621

E = 1.45 – (-0.01968)

E = +1.430  V

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

b is the correct answer

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