Density or molecular weight of a gas from its pressure and temperature

1. A.
   1:2
2. B.
   2:3
3. C.
   3:4
4. D.
   2:1

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1. A.
   $\frac{2}{3}\rho_{0}$
2. B.
   $\ \frac{3}{4}\rho_{0}$
3. C.
   $\frac{4}{3}\rho_{0}$
4. D.
   $\frac{3}{2}\rho_{0}$

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1. A.
   $x$
2. B.
   $\dfrac{10x}{283}$
3. C.
   $283x$
4. D.
   $\dfrac{283x}{383}$

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