What occurs when the temperature of 10.0 grams of water is changed from 15.5°C to 14.5°C?
What happens when the temperature of 10.0 grams of water is changed from 15.5°C to 14.5°C?
- Does the water absorb 42 joules of energy?
- Does the water release 42 joules of energy?
- Does the water absorb 4200 joules of energy?
- Does the water release 4200 joules of energy?
4 Answers
Q = m*Cp*(del T)
Where m = mass
cp = specific heat capacity = 4.1855 J g–1 K–1 at 15 deg C
del T = temp change = 14.5-15.5 = - 1 deg C
there fore,
Q = 10*4.1855*-1 = - 41.855 J
Hence 42 joules will be release by water when temp is decrease from 15.5 to 14.5 deg C.
The specific heat capacity of water is approximately 4.2 kilojoules per kilogram per Kelvin. 1 degree Celsius is equivalent to 1 Kelvin.
In your example you have 0.01 kilograms of water and a -1 degree temperature change. So multiply 4.2 kilojoules by 0.01 and -1 to get -42 joules. In other words 42 kilojoules is released (answer 2).
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