Enthalpy Of Reaction And Calorimetry Worksheet Page 3
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20Heat and Calorimetry worksheet
Specific Heat Capacity, c H
O is 4.18 J/g ºC
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1. How many joules are needed to warm 25.5 grams of water from 14ºC to 22.5ºC? (ans. 9.1 x 10 2 J)
2. Calculate the number of joules released when 75.0 grams of water are cooled from 100.0ºC to 27.5ºC.
(ans. 2.27 x 10 4 J)
3. If 1.13 x 10 4 J of heat is added to a water sample and the temperature rises from 88.0 ºC to its boiling
point, what mass of water is in the sample? (ans. 225 g )
4. The specific heat capacity of gold is 0.128 J/g ºC. How much heat would be needed to warm 250.0
grams of gold from 25.0 ºC to 100.0 ºC? (ans. 2.40 x 10 3 J)
5. The specific heat capacity of zinc is 0.386 J/g ºC . How many joules would be released when 454 grams
of zinc at 96.0 ºC were cooled to 28.0 ºC? (ans. 1.19 x 10 4 J)
6. How much heat is absorbed by 2.50 x 10 2 g of water and the 450. g Al can (c Al is 0.900 J/g ºC ) when
they are heated from 10.0 ºC to 85.0 ºC? (ans. 1.09 x 10 5 J)
7. What is the temperature change if 1.386 x 10 3 J is absorbed by 60.0 g of copper which has a specific heat
capacity of 0.385 J/g ºC? (ans. 60.0 ºC )
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