Honors Chemistry
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Calorimetry Practice Worksheet
1. A small pebble is heated and placed in a coffee cup calorimeter containing 25 g of water at 25.0˚C. The
water reaches a maximum of 26.4˚C. How many joules of heat were released by the pebble?
2. When 50.0 g of water containing dissolved HCl are mixed with 50.0 g of water containing dissolved NaOH in a
coffee cup calorimeter at a 25.0˚C, the temperature of the solution increases to 26.0˚C. How much heat was
released by this reaction?
3. If 22.0 g of water containing 0.030 moles of HCl are mixed with 39.0 g of water containing 0.030 moles
NaOH in a coffee cup calorimeter at 27.0˚C. The final temperature of the solution is 35.0˚C. How
much heat is released in the reaction?
4. A 4.7 g sample of methane (CH4) is burned in a bomb calorimeter containing 912 grams of water at an
initial temperature of 29.1ºC. After the reaction occurs, the final temperature of the water is 38.4ºC. The
heat capacity of the calorimeter is 678 J/ºC. The specific heat of water is 4.184 J/g ºC. Calculate qrxn in J.
5. A 6.8 mole sample of ethane (C2H6) is burned in a bomb calorimeter containing 1867.15 grams of water
at an initial temperature of 14.2ºC. After the reaction occurs, the final temperature of the water is 48.4ºC.
The heat capacity of the calorimeter is 784 J/ºC. The specific heat of water is 4.184 J/g ºC. Calculate qrxn
in J.