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23 Nov 2019

Assume that the kinetic energy of a 1600 car moving at 125 is converted entirely into heat. How many calories of heat are released? and What amount of water in liters could be heated from 20.0 to 58.0 by the car's energy? (One calorie raises the temperature of 1 of water by 1.)

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Question 2 Energy Calculations

a) Calculate the heat energy (q) when 12.0 g of water is heated from 20oC to 100oC. The

specific heat for water is given in your textbook.

b) Is the process of heating water exothermic or endothermic? Explain your answer.

Question 3 Energy Calculations

You dissolve 0.1 mol of ammonium nitrate in 100 mL of H2O. The temperature of the solution

changes from 22oC to 15oC. The specific heat capacity for water is 4.184 J/g.K. Show all

calculations on a separate sheet of paper!

a) Is this reaction endothermic or exothermic?

b) Calculate the heat, q, released or absorbed in the dissolution reaction.

c) Calculate the enthalpy change, ?Hrxn (kJ/mol), for dissolving 1 mol of ammonium nitrate.

Question 4. A gas expands from 264 mL to 971 mL at constant temperature. Calculate

the amount of work done in Joules by the gas when it expands against a constant pressure of 955

torr.

Question 5 Energy Calculations

a) The nutritional calorie (Calorie) is equivalent to 1 kcal. One pound (1.0 lb) of body fat is

equivalent to 4.1 x 103 kcal. Express this quantity in joules and kilojoules. Use

scientific notation for your answer!

b) If an athlete expends 1850 kJ/h (kilojoules per hour), how long does he have to exercise

to work off 1.0 lb of body fat?

c) The average amount of calories burned during running is 125 kcal/mile. How many

miles does this athlete have to run to burn off 1.0 lb of body fat?

Question 6

Calculate ?Ho for the following reactions at 298 K. Give the balanced thermochemical

equations and show the correct physical state in each equation. Calculate the enthalpy change

for each reaction. You will find thermochemical data in the back of your textbook in Appendix 3

(p. A-8 to A-12)

a) The formation of 1 mol of HCl (gas) from its elements

b) The formation of 1 mol of sodium chloride from its elements

c) The combustion of 1 mol glucose to water and carbon dioxide

d) HCl(g) + NH3(g) ? NH4Cl(g)

Question 7

Calculate heat of formation of SO2 under nonstandard state conditions, given the following

equations

SO2(g) +

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

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Assume that the kinetic energy of a 1600 car moving at 125 is converted entirely into heat. How many calories of heat are released? and What amount of water in liters could be heated from 20.0 to 58.0 by the car's energy? (One calorie raises the temperature of 1 of water by 1.)

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