Chapter 6
2000 cals of energy are used to heat 1 kg of water originally at 25ºC. What is the final temperature of
the water?
27 degrees C
The formation of rust (Fe2O3) from solid iron and oxygen gas releases 1.7 x 103 kJ. How many kJ are
released when 2.00 g of Fe react? How many grams of rust form when 150 kcal are released?
15 kJ
28 g rust
An ice cube tray holds 325g of water. If the water initially has a temperature of 25ºC, how many
kilojoules of heat must be removed to cool and freeze the water at 0ºC?
8125 + 26000 = 34,125 cal
= 143 kJ
When 1.0 g gasoline burns, 11,500 calories of energy are given off. If the density of gasoline is 0.74
g/mL, how many kilocalories of energy are obtained from 1.0 gallons of gasoline?
3.2 x 10^4 kJ
The melting point of benzene is 5.5ºC and its boiling point is 80.1ºC. Sketch a heating curve for
benzene from 0ºC to 100ºC.
-What is the state of benzene at 15ºC Liquid
-What is the state of benzene at 63ºC Liquid
-WHAT IS THE STATE OF BENZENE AT 98ºC GAS
-At what temperature will both a liquid and gas be present? 80.1
A balloon has a volume of 750 L when filled with helium at 8ºC at a pressure of 380 torr. What is the
new volume of the balloon when the pressure is 0.20 atm and the temperature is -45ºC?
1520 L
A sample of Neon has a volume of 250 mL at 30ºC and a pressure of 745 mmHg. What is the volume
of the nitrogen at STP?
0.22 L
A steel cylinder with a volume of 15.0L is filled with 50.0g nitrogen gas at 25ºC. What is the pressure
of the gass in the cylinder?
2.91 atm
A container is filled with 4.0 x 1022 O2 molecules at 5.0ºC and 845 mmHg. What is the volume in
mL of the container?
1,400 mL
Magnesium reacts with Oxygen to form magnesium oxide. How many liters of oxygen gas at STP are
needed to react completely with 8.0g of Magnesium?
3.7 L oxygen
A 250 mL sample of N2 has a pressure of 745 mm Hg at 30ºC. What is the mass of the nitrogen?
0.28 g N2
What is the total pressure in mmHg of a gas mixture containing Argon at 0.25 atm, Helium at 350
mmHg, and Nitrogen at 360 mmHg?
900 mmHg
Chapter 7
How does the temperature and pressure affect the solubility of solids in water? How does it affect the
solubility of gases in water?
Solids in liquids – solubility increases with temperature
Gases in liquids – solubility decreases as temperature increases
Potassium Fluoride has a solubility of 92g KF in 100g water at 18ºC. State if the following forms a
saturated or unsaturated solution at 18ºC:
-46g KF and 100g Water unsat
-46g KF and 50g Water
sat
-184g KF and 150g Water sat
A solution is 35% (v/v) Butanol in water. How many mL of Butanol are in 1.5 L of the solution?
530 mL
How many grams of HF are in 47.6 mL of a 1.80 M HF solution?
1.71 grams HF
What is the molarity when 2.0L of 10 M NaOH is diluted to a final volume of 10. L?
2M
What is the final volume in mL when 5.00 mL of 12.0M KOH is diluted to 6.00 M KOH? What is the
volume when it is diluted to 1.20 M KOH?
10.0 mL
50.0 mL
Calcium Carbonate (CaCO3) reacts with stomach acid (HCl) according to the following
UNBALANCED equation:
Tums, and antacid, contains CaCO3. If Tums is added to 20.0 mL of 0.400 M HCl, how many grams
of CO2 gas are produced?
0.176 g CO2