ideal gas intro Flashcards
what are ideal gases?
Ideal gases are ‘idealised and imaginary’ substances that obey the ideal gas law over a wide range of
possible thermodynamic states, in terms of 𝑷, 𝑻, 𝒗
what are the assumptions of ideal gases? (4)
-Gas consists of randomly moving point masses, having a velocity and momentum,
-Gas molecules do not occupying any volume
-There are no intermolecular (attractive or repulsive) forces
-Particle collisions are perfectly elastic point-like collisions
what gases can be treated like ideal gases and why?
Many gases (N2, H2, Ar) can be treated as ideal gases with negligible (<1%) error.
- True for gases with low densities (high 𝑣, high 𝑇 and low 𝑃)
what gas laws are combined to make the ideal gas law?
Charles’ Law, Boyle’s Law, Gay-Lussac’s law and Avogadro’s Law
what is gay lussac’s law?
Gay-Lussac’s Law states that the pressure of a gas is directly proportional to its temperature when the volume is constant.
P1/T1 = P2/T2
what gas laws make up the combined gas law?
The combined gas law combines Charles’s, Boyle’s, and
Gay-Lussac’s laws.
what is the combined gas law
The Combined Gas Law relates pressure (P), volume (V), and temperature (𝑇) of a gas when the amount of gas remains constant.
P1V1/T1 = P2V2/T2
what is Avogadro’s law
Avogadro’s Law states that the volume (𝑉) of a gas is directly proportional to the number of moles (𝑛) of gas present, provided the temperature (T) and pressure (P) remain constant.
V1/n1 = V2/n2
define the ideal gas law
Pv=nRsT
how is the specific gas constant Rs defined and figured out?
Rs = Ru/M
where Ru is the universal gas constant and M is the molar mass/molecular weight (mass of one mole)
how do you find the universal gas constant
Ru=Na Kb
where both are known constants
how many different ways does the ideal gas equation appear?
4 different ways
1. OG: Pv=RsT (J/kg)
2. x mass: Pv =mRsT (J)
3. where m = Mn and Rs = Ru/M (J)
4. in terms of Ru = PV = nRuT (J)
