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Compressed air can be pumped underground into huge caverns as a form of energy storage. The...

Compressed air can be pumped underground into huge caverns as a form of energy storage. The volume of a cavern is 4.9 × 105 m3, and the pressure of the air in it is 6.6 × 106 Pa. Assume that air is a diatomic ideal gas whose internal energy U is given by U= (5/2)nRT. If one home uses 30.0 kW h of energy per day, how many homes could this internal energy serve for one day?

I keep getting 748611 homes but that is not correct.

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