Homework Help: Chemistry

Posted by norma on Saturday, July 30, 2011 at 5:37pm.

Suppose a fuel-cell generator was used to produce electricity for a house. If each H2 molecule produces 2e-, how many kilograms of hydrogen would be required to generate the electricity needed for a typical house? Assume the home uses about 850 kWh of electricity per month, which corresponds to approximately of 2.65 * 104 mol electrons at the voltage of a fuel cell.

Chemistry - DrBob222, Saturday, July 30, 2011 at 6:07pm
2e/mol H2 = 2e/2g = 1e/1g
2.65E4 moles e x (6.022E23 e/mole e) x (1 e/1g) = ??grams, then convert to kg. Check my thinking.
Chemistry - norma, Saturday, July 30, 2011 at 8:12pm
thank Dr.Bob222 I see you got the same answer I did. I got one more I need help with if you can help me please
Classify each of the following solutions as acidic, basic, or neutral based on the pH value.
(a) pH = 8.0
(b) pH = 7.0
(c) pH = 3.5
(d) pH = 6.1
Chemistry - DrBob222, Saturday, July 30, 2011 at 8:37pm
pH = 7 is neutral
pH<7 = acidic
pH>7 = basic

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