concreteGases Properties of gases  Elemental (He) or molecular (co2).  No shape-expands to fill any container  Highly compressible (density function of applied pressure).  Form homogeneous mixtures.  Individual molecules far apart from each other. Pressure = force/area  Gases exert pressure on any surface that it comes into contact with.  Units of pressure Nm-2 = Pascal’s Other units:  Standard atmospheric pressure typically supports 760mm Hg at sea level.  1 atmosphere (atm) = 760mm Hg (torr) = 1.015 * 10’5 Pa (pascals) = 101.3 kPa Gas Laws …showed first 75 words of 275 total…

…showed last 75 words of 275 total…T, ie when no attractive force between molecules. R = Universal gas Constant  8.3143 JK-1 mol –1 P in kPa, V in L P in Pa, V in m3  0.0821 L atm K-1 mol-1 P= atm, V in L  units very important. Gas Density  Rearranging ideal gas equation. n/V = D/RT Multiply both sides by Molar Mass (M) M n/v = g/mol * mol/L = g/L = density d or p d = M P/RT M = dRT/P