Question

1. The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.23 pounds of ethane (fuel value is 11.36 kcal/g) is used to heat 121.0 kg of water at an initial temperature of 20.6C, what is the final temperature?

2. A 1445 kg car is traveling down the road at 93.0 km/h. while traveling at this rate of speed, what is the kinetic energy of this vehicle in kilojoules?

3. when 1576 j of heat energy is added to 38.7 g of hexane, C6H14, the temperature increases by 18.0 C . calculate the molar heat capacity of C6H14.

4. If a system has 2.50 x 10^2 kcal of work done to it, and releases 5.00 x 10^2 kj of heat into its surroundings, what is the change in internal energy of the system?

5. when a 3.00 -g sample of RbBr is dissolved in water in a calorimeter that has a total heat capacity of 0.9690 kj .K^-1, the temperature decreases by 0.410 K, calculate the molar heat of solution of RbBr