Multiple Choice
Which of the following provides the most energy per gram?
8. Thermochemistry
Nature of Energy
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An energy efficient refrigerator uses 780 kWh of electrical energy per year. How many kilocalories of electricity does it use in three years?
A
2.0 x 106 kcal
B
8.3 x 105 kcal
C
2 x 106 kcal
D
8.3 x 106 kcal
Verified step by step guidance1
First, understand the relationship between kilowatt-hours (kWh) and kilocalories (kcal). 1 kWh is equivalent to 860 kcal.
Calculate the total energy consumption in kWh for three years by multiplying the annual consumption by 3: 780 kWh/year * 3 years.
Convert the total energy consumption from kWh to kcal using the conversion factor: Total kWh * 860 kcal/kWh.
Ensure the units are consistent and correctly converted from kWh to kcal.
Compare the calculated value with the given options to determine the correct answer.
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