ChemistryWiki | RecentChanges | Preferences
2021-2022 Review Problems for Heat Calculations Only
Answer the following questions showing all work as discussed in class/notes. Please answers questions on a separate sheets of paper where there can only be 3 problems per page (a page is front and back so that means you will need to use 2 sheets of paper).
1) How much heat (in kcals) is required to raise the temperature of 675ml of water from 35.6degC to 62.9degC?
2) What is the mass of olive oil if you added 5.1kJ to the oil (making some deep fried chicken, thanks for recipe Rachel Ray!!) and the oil's temperature raised from 63.2degC to 87.3degC? (coil = 1.97J/(g degC) ).
3) What is the specific heat of a substance if the temperature of the substance is raised from 15.2degC to 47.3degC by adding 14.1kcal of heat energy. The mass of the substance is 2.3 kg. Please put answer in cal / (g degC).
4) A reaction runs in a calorimeter and absorbs 7.41E4 J of energy. This causes the temperature of the water in the calorimeter to drop from 25.0degC to 12.5degC. What is the mass of the water?
5) The stored energy in foods is usually measured in Calories (which are 1000cal). One gram of peanut oil releases 8.84 Calories when it is burnt. If that one gram of peanut oil is burned in a calorimeter containing 500.g of water at 25.degC, what will the final temperature of the water be?
6) A 400.0g sample of water at 25.0degC absorbs 15.89kJ of energy. What will be the final temperature of the water?
Answer for Part II:
1) 18.4kcals 2) 110g or 1.1E2g 3) 0.19cal/(g-degC) 4) 1.42E3g 5) 43degC 6) 34.5degC