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Gases Part 1. Elements that exist as gases at 25 0 C and 1 atmosphere. Physical Characteristics of Gases. Gases assume the volume and shape of their containers. Gases are the most compressible state of matter. Gases will mix evenly and completely when confined to the same container.

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slide1

Gases

Part 1

slide4

Physical Characteristics of Gases

  • Gases assume the volume and shape of their containers.
  • Gases are the most compressible state of matter.
  • Gases will mix evenly and completely when confined to the same container.
  • Gases have much lower densities than liquids and solids.
slide5

Force

Area

Barometer

Pressure =

(force = mass x acceleration)

Units of Pressure

1 pascal (Pa) = 1 N/m2

1 atm = 760 mm Hg = 760 torr

= 101,325 Pa = 14.7 psi = 29.92 in. Hg

slide6

10 miles

0.2 atm

4 miles

0.5 atm

Sea level

1 atm

boyle s law
Boyle’s Law

P α 1/V

This means Pressure and Volume are INVERSELY PROPORTIONAL if moles and temperature are constant (do not change). For example, P goes up as V goes down.

P1V1 = P2 V2

Robert Boyle (1627-1691). Son of Earl of Cork, Ireland.

charles s law
Charles’s Law

If n and P are constant, then V α T

V and T are directly proportional.

V1 V2

=

T1 T2

  • If temperature goes up, the volume goes up!

Jacques Charles (1746-1823)

gay lussac s law
Gay-Lussac’s Law

If n and V are constant, then P α T

P and T are directly proportional.

P1 P2

=

T1 T2

If temperature goes up, the pressure goes up!

Joseph Louis Gay-Lussac (1778-1850)

combined gas law
Combined Gas Law
  • The good news is that you don’t have to remember all three gas laws! Since they are all related to each other, we can combine them into a single equation. BE SURE YOU KNOW THIS EQUATION!

P1 V1 P2 V2

=

T1 T2

slide11

STP in chemistry stands for Standard Temperature and Pressure

Standard Pressure = 1 atm (or an equivalent)

Standard Temperature = 0 deg C (273 K)

STP allows us to compare amounts of gases between different pressures and temperatures

avogadro s law
Avogadro’s Law

Va number of moles (n)

Constant temperature

Constant pressure

V = constant x n

V1/n1 = V2/n2

ideal gas equation

Boyle’s law: V a (at constant n and T)

Va

nT

nT

nT

P

P

P

V = constant x = R

1

P

Ideal Gas Equation

Charles’ law: VaT(at constant n and P)

Avogadro’s law: V a n(at constant P and T)

R is the gas constant

PV = nRT

slide14

R =

(1 atm)(22.414L)

PV

=

nT

(1 mol)(273.15 K)

The conditions 0 0C and 1 atm are called standard temperature and pressure (STP).

PV = nRT

R = 0.082057 L • atm / (mol • K)

Experiments show that at STP, 1 mole of an ideal gas occupies 22.414 L.

slide15

m

V

PM

=

RT

dRT

P

Density (d) Calculations

m is the mass of the gas in g

d =

M is the molar mass of the gas

Molar Mass (M ) of a Gaseous Substance

d is the density of the gas in g/L

M =

slide16

M =

dRT

P

A 2.10-L vessel contains 4.65 g of a gas at 1.00 atm and 27.00C. What is the molar mass of the gas?

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