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Assuming ideal behavior the ratio of density of ammonia to that of hydrogen chloride at same temperature and pressure is (Cl = 35.5 amu)
For ideal gases at the same temperature and pressure, density is proportional to molar mass. The ratio is $$\frac{M(\text{NH}_3)}{M(\text{HCl})} = \frac{17}{36.5} \approx 0.46$$.
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