In the case of TP, V1 / V2 = N1 / N2 = N1 / N2, and in the case of TP, density 1 / density 2 = M1 / m2 are both correct

All right
First, PV = NRT can be deduced
Second: v = m / density, n = m / m, so if we have PM / density = m / M RT, we can deduce it

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