Gases Ideal Gas law.

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Presentation transcript:

Gases Ideal Gas law

Combinations of Gas Laws Combined Gas Law: Ideal Gas Law Universal Gas Constant (R) combined proportionality constant equals 0.08206 L*atm/mol*K equals 8.314 J/mol*K

Real Gases vs. Ideal Gases an ideal gas is a hypothetical substance that obeys the ideal gas law real gases approach this behavior closest at low pressure and high temperature more on this in section 5.6

Gases Gas Stoichiometry

Molar Volume 22.42 L / mol at STP Standard Temperature and Pressure (STP): 0°C and 1 atm

Molar Mass and Density

Example 1 CaO is made from decomposition of CaCO3. Find the volume of CO2 at STP made from decomposition of 152 g CaCO3.

Example 2 A sample of CH4 gas having a volume of 2.80 L at 25°C and 1.65 atm was mixed with sample of O2 gas having volume of 35.0 L at 31°C and 1.25 atm. The mixture formed CO2 and H2O. Find the volume of CO2 at 2.50 atm and 125°C.

Example 2 Find the limiting reactant: CH4 is ER O2 is LR

Example 2 Find the amount of product produced: Find the volume of product produced:

Example 3 If the density of a sample of gas is 1.95 g/L at 1.50 atm and 27°C, find the molar mass of gas. What could the identity of the gas be? Oxygen!!