Large bed of rocks are used in some solar-heated homes to store heat. Assume tha
ID: 903001 • Letter: L
Question
Large bed of rocks are used in some solar-heated homes to store heat. Assume that the specific heat of the rocks is 0.82 J/g-K. Calculate the quantity of heat absorbed by 50.0 kg of rocks if their temperature increases by 12.0 •C. What temperature change would these rocks undergo if they emitted 450 kJ of heat? Large bed of rocks are used in some solar-heated homes to store heat. Assume that the specific heat of the rocks is 0.82 J/g-K. Calculate the quantity of heat absorbed by 50.0 kg of rocks if their temperature increases by 12.0 •C. What temperature change would these rocks undergo if they emitted 450 kJ of heat?Explanation / Answer
Cp = 0.82 J/gC
Q = ?
m = 50 kg or 50,000 g
dT = +12°C
a) heat
Q = m*CpdT
Q = 50*0.82*12= 492 kJ
If Q = 450 kJ then
b) find dT
Q = m*cp*dT
dT = Q/(m*cp)
dT = 450 kJ / (50kg*0.82) = 10.97°C
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