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
‘STP’ means Standard
Temperature and Pressure.
At STP, one mole of gas
occupies 22.4 L.
Converting Between Units of Pressure
DIRECTIONS: For the following problems, show dimensional analysis. Include
units in your answer and round to the nearest hundredth.
1. Convert 0.875 atm to mmHg
2. Convert 745.0 mmHg to atm.
3. Convert 2 atm to torrs.
Gas Laws Problems
DIRECTIONS: For the following problems, show the Given, Formula, and
Substitution. Include units in your answer and round to the nearest hundredth.
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?
1.
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?
2.
A constant volume of oxygen is heated from 100C to
185C. The initial pressure is 4.1 atm. What is the final
pressure?
Converting Between Units of Pressure
DIRECTIONS: For the following problems, show dimensional analysis. Include
units in your answer and round to the nearest hundredth.
4. Convert 0.955 atm to kPa.
5. Convert 98.35 kPa to atm.
6. Convert 233.56kPa to atm.
Converting Between Units of Pressure
DIRECTIONS: For the following problems, show dimensional analysis. Include
units in your answer and round to the nearest hundredth.
7. Convert 740.0 mmHg to kPa.
8. Convert 99.25 kPa to mmHg.
9. Convert 1600mmHg to kPa.
Converting Between Units of Pressure
DIRECTIONS: For the following problems, show dimensional analysis. Include
units in your answer and round to the nearest hundredth.
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.
Converting Between Units of Pressure
DIRECTIONS: For the following problems, show dimensional analysis. Include
units in your answer and round to the nearest hundredth.
13. Convert 1.69 atm to mmHg
14. Convert 0.3587 atm to kPa
15. Convert 820.1 mmHg to atm
Converting Between Units of Pressure
DIRECTIONS: For the following problems, show dimensional analysis. Include
units in your answer and round to the nearest hundredth.
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.