Assuming air as an ideal gas, what will ...

Assuming air as an ideal gas, what will be its effective molecular weight it `500` cc sample of air at `27°C` weights `0.6g` at one atmospheric pressure?

`59.2g mol^-1`

`14.8gmol^-1`

`44.4g mol^-1`

`29.6g mol^-1`

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