Putting it all together: The Ideal Gas Law. We can combine the relationships stated in the three laws to create a single equation that will allow us to predict the pressure, volume or temperature of a certain number of moles of gas V=n(constant/P V=n(constant)T P=n(constant)T
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PV=nRT where R=8.314 J/Kmol
We need to define a couple of terms and identify a couple of constants:
At STP, Vm of ideal gases is 22.4 L/mole
At SATP, Vm of ideal gases is 24.79 L/mole
If the molar masses are different, the two gas samples will have different masses.
The higher the molar mass, the higher the density
The molar concentrations and densities of gases increase as they are compressed (less volume, right?), but decrease as they are heated (volume increases, right?). The density of a gas depends on its molar mass.
Balance the chemical equation
Calculate the number of moles of reactant consumed
Use the stoichiometric coefficients from the chemical reaction to relate the # moles of product made to the # of moles of reactant consumed.
PA = xAP