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What is the density(in g/L) of HCl(g) at STP?

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Final answer:

At STP, the density of HCl gas is 1.63 g/L. This is calculated using HCl's molar mass (36.46 g/mol) and the molar volume of an ideal gas at STP (22.4 L/mol).

Step-by-step explanation:

The question asks for the density of HCl gas at standard temperature and pressure (STP), where STP is defined as 0°C (273 K) and 1 atm pressure. To calculate the density of HCl at STP, we use the molar mass of HCl, which is approximately 36.46 g/mol, along with the fact that one mole of any ideal gas occupies 22.4 liters at STP. The density (d) can be found using the formula d = molar mass/volume. For HCl at STP:

d = 36.46 g/mol / 22.4 L/mol

= 1.63 g/L

This density is slightly less than that of ammonia at STP, which makes sense because HCl gas has a lower molar mass compared to ammonia. Understanding gas density is essential in chemistry for various applications including reactions involving gases and gas stoichiometry.

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