Standard Temperature and Pressure

STP refers to Standard Temperature and Pressure, which are as follows:

Standard Temperature: 0 degrees Celsius or 273 K
Standard Pressure: 1 atm or 760 mmHg

If you use PV = nRT, you will find that universally, 1 mole of any gas at STP will have the same volume: 22.4L.

STP1

Problem: What is the volume (in liters) occupied by 49.8 g of HCl at STP?

GIVEN:

STP2

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