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UTSC (20,000)

Chemistry (300)

CHMA10H3 (100)

Ann Verner (20)

Chapter 6

Department

ChemistryCourse Code

CHMA10H3Professor

Ann VernerChapter

6This

**preview**shows pages 1-2. to view the full**6 pages of the document.**Chapter 6: Gases

6-1:Properties of gases- gas pressure

- Gases expand to fill their containers and assume the shape of their container s

- Diffuse into one another and mix in all proportions

- H2, Methane combustable

4 properties determine the physical behaviour of gases:

1. Amount of gas in moles

2. Volume

3. Pressure

4. Temperature

Concept of pressure:

- Pressure: force per unit area

Liquid pressure:

Barometric pressure:

- Atm ( standard atmosphere) - pressure exerted by a mercury column of exactly 760 mm in

height when the density of mercury is 13.59 g/cm^3

1 atm= 760 mmHg

1 atm = 760 Torr

Standard Condition of Temperature And Pressure:

Manomete=rs:

Pgas=Pbar +changeP

6-2 The Simple Gas Laws:

Boyle’s law: For a fixed amount of gas at the constant temperature , the gas volume is

inversely proportional to the gas pressure

Only pages 1-2 are available for preview. Some parts have been intentionally blurred.

-if the weight on the piston is doubled then the pressure is doubled and the volume

decrease to ½ its original.

PV=a ( a constant)

- Gas properties depend on temperate and pressure

- Standard temp = 0 C or 273.15K, standard pressure: 1 atm (STP)

Charles law: The volume of a fixed amount of gas at constant pressure is directly

proportional to the Kelvin (absolute) temperature.

T(K)= t( C) + 273.15

V=bT ( b is a constant)

Standard Temperature and Pressure:

- 0C=273.15K

- 1 atm=760mmHg

- STP ( standard temperature and Pressure)

Avogadro’s Law

- Equal volume of different gases compared at the same temp and pressure contains

equal number of molecules

- Law: at a fixed temp and pressure the volume of a gas directly proportional to the

amount of gas ( V prop n, V=c*n)

- 1 mol gas= 22.4L ( at STP)

6.3 combining the gas laws: ideal gas equation and the general gas equation

1. Boyle’s law describes the effect of pressure, V ( PV=a)

2. Charles’s law describes the effect of temperature, V ( V=bT)

3. Avogadro’s Law describes the effect of the amount of gas, V (V= c*n)

Ideal Gas law equation:

V and V= RnT/P

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