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Heating 800 grams of water by one degree Celsius requires how many times the energy needed for one gram?
A800 times as much
B80 times as much
C8 times as much
DThe same amount
Answer & Solution
Correct answer: A. 800 times as much
1. The specific heat of water is 4.184 joules per gram per degree Celsius.
2. So 4.184 joules is required to heat 1 gram of water by 1 degree Celsius.
3. We will need 800 times as much to heat 8.0 times ten squared grams of water by 1 degree Celsius.
4. Heat scales linearly with mass at fixed temperature change.
5. Raising that same sample by 64 degrees would then need 64 times as much again.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 5 'Thermochemistry', sections 5.1-5.3_
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