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A recent home energy bill indicates that a household used 455 kWh (kilowatt‑hour) of electrical energy...

A recent home energy bill indicates that a household used 455 kWh (kilowatt‑hour) of electrical energy and 225 therms for gas heating and cooking in a period of 1 month. Given that 1.00 therm is equal to 29.3 kWh, how many milligrams of mass would need to be converted directly to energy each month to meet the energy needs for the home?

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