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Increasing the amount of intermolecular forces causes more deviations from ideality, so gases that have a larger molar mass would be less ideal that gases with a lower molar mass. (E.g. CO2 would be less ideal than He)
Pretty much all gases are not ideal. an "ideal gas" is just a concept to help us be able to solve problems and equations assuming that the gas does not take up any volume or have any intermolecular forces (which non-ideal gases obviously do).
Most gases are non ideal. Ideal gases are used to make it easy to calculate properties of gases using the ideal gas law (PV = nRT) as long as the pressure isn't too high or the temperature isn't too low or else that will cause deviations in the calculations.
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