Warm-up problems used to start my AP Chemistry class. Most of these warm-ups will focus on content already covered in the course, or in prior courses, in an effort to reduce the need for review prior to the AP Test.
A 40.0 gram sample of iron at a temperature of 120.0°C is placed in 100. mL of water that has an initial temperature of 24.5°C. Determine the temperature at which the system reaches thermal equilibrium. The specific heat capacity of water is 4.18 J/g·°C. The specific heat capacity of iron is 0.45 J/g·°C.
The heat of combustion of propane, C3H8, is -2221 kJ/mol. What mass of propane must be burned in order to heat 2.00 kg of water from 20.o°C to 80.0°C if the transfer of energy is only 40% efficient? The specific heat capacity of water is 4.18 J/g·°C.
A 50.0 gram piece of iron (specific heat = 0.46 J/g·K) at a temperature of 140.0°C is transferred to a Styrofoam cup calorimeter containing 100.0 mL of water (specific heat = 4.18 J/g·K) at 18.0 °C. What is the final equilibrium temperature of the water-iron system?
Describe two major sources of experimental error in the measurements described