18. (6 points-show your work to receive partial credit) At Niagara Falls, fallin

Question

18. (6 points-show your work to receive partial credit) At Niagara Falls, falling water is used to generate electricity. Imagine that a nearby chemical plant uses some of that electricity to electrolyze pure water into hydrogen gas and oxygen at 25°C according to the equation: 2 H20(I) 2 H2(g) + Odg) Assume that 1 kg of water going through the power company's turbine generates 250. J of energy. Assume that this energy is used to drive the reaction above with 100% efficiency (ie. no energy is lost in the process). How many kilograms of falling water are required to hydrolyze one kilogram of water at 25°C according to the reaction above? You will need to use information on the cover and/or in the table on page 7 of this exam

Explanation / Answer

1 kg of water generates 250 J of energy.

286 kJ of energy is required to hydrolyze 1 mole of H2O(l).

1 kg of water contains = 1000 / 18 = 55.55 moles of H2O

Energy required = 286 x 55.55 = 15888.89 kJ

Water required = 15888.89 / 0.25 = 63.555 kg

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