"Under constant conditions of P(pressure) and T(temperature) (and R [gas constant]), write an equation showing d(density) written as a function of M(molecular mass)."

I don't understand this, really! Please help! Thanks in advance!

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  1. I'm not sure what you are looking for but here is the general gas law written to include density.
    PV = nRT
    n = mols = grams/molar mass.
    PV = (g/molar mass) RT
    P = gRT/(molar mass*V)
    density = g/V; therefore,
    P = density*RT/molar mass.

    Depending upon how I interpret your question your question may be asking for the above equation. However, if I go further, and show P, T, and R as constant, then constant = density/molar mass
    If this is not exactly what you want please clarify.

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  2. Remember P V = n R T
    now n is the number of moles
    so n/V = P /R T
    that is the number of moles per unit volume
    what we want is the mass per unit volume
    So multiply both sides by the mass per mole

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  3. This is pretty much what I'm looking for! Thanks!

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