Converting Between Units of Pressure• There are many different units of pressure used

in chemistry. You must be able to use all of them and convert between them. Here they are:– atmospheres (symbol = atm) – millimeters of mercury (symbol = mm Hg) now called

torrs – kilopascals (symbol = kPa)

• Conversions:1 atm = 760.0 mm Hg = 760.0 torr = 101.33 kPa

Standard Temperature: 0°C/ 273K

Standard Pressure: 1 atm/760 mmHg/760 Torr

You need to know:‘STP’ means Standard Temperature and Pressure. At STP, one mole of gas occupies 22.4 L.

Converting Between Units of Pressure

1. Convert 0.875 atm to mmHg

2. Convert 745.0 mmHg to atm.

3. Convert 2 atm to torrs.

DIRECTIONS: For the following problems, show dimensional analysis. Include units in your answer and round to the nearest hundredth.

Gas Laws Problems

1. If I have 5.6 liters of gas in a piston at a pressure of 1.5 atm and compress the gas until its volume is 4.8 L, what will the new pressure inside the piston be?

2. If I have 45 liters of helium in a balloon at 250 C and increase the temperature of the balloon to 550 C, what will the new volume of the balloon be?

3. A constant volume of oxygen is heated from 100C to 185C. The initial pressure is 4.1 atm. What is the final pressure?

DIRECTIONS: For the following problems, show the Given, Formula, and Substitution. Include units in your answer and round to the nearest hundredth.

Converting Between Units of Pressure

4. Convert 0.955 atm to kPa.

5. Convert 98.35 kPa to atm.

6. Convert 233.56kPa to atm.

DIRECTIONS: For the following problems, show dimensional analysis. Include units in your answer and round to the nearest hundredth.

Converting Between Units of Pressure

7. Convert 740.0 mmHg to kPa.

8. Convert 99.25 kPa to mmHg.

9. Convert 1600mmHg to kPa.

DIRECTIONS: For the following problems, show dimensional analysis. Include units in your answer and round to the nearest hundredth.

Converting Between Units of Pressure

10. A gas sample has a pressure of 800.0 mmHg. What is the pressure of this gas sample in atmospheres?

11. Using the gas sample mentioned above, what is its pressure in kilopascals?

12. A tank of oxygen is under a pressure of about 4.00 x 103 kPa. Express this pressure in millimeters of mercury.

DIRECTIONS: For the following problems, show dimensional analysis. Include units in your answer and round to the nearest hundredth.

Converting Between Units of Pressure

13. Convert 1.69 atm to mmHg

14. Convert 0.3587 atm to kPa

15. Convert 820.1 mmHg to atm

DIRECTIONS: For the following problems, show dimensional analysis. Include units in your answer and round to the nearest hundredth.

Converting Between Units of Pressure

16. Convert 689 mm Hg to Pa.(HINT: How many Pascals in a kPa?)

17. Convert 725.0 torr to mmHg

18. Convert 32°C to Kelvin.

DIRECTIONS: For the following problems, show dimensional analysis. Include units in your answer and round to the nearest hundredth.