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Question

How do you calculate standard temperature and pressure?


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Solution

Step 1: First define the standard temperature and pressure.

A standard condition of an environment for a chemical reaction to proceed then the standard temperature and pressure (STP) is maintained.

The standard conditions are defined by the following elements:

  1. The standard temperature is 273.15K=0°C=32°F .It is the same as the freezing point for pure water.
  2. The standard pressure is 1atm=760Torr=760mmHg=101.35kPa. It is same as the pressure of 1 atmosphere.
  3. The Standard pressure is defined as the pressure exerted by a column of mercury (symbol Hg) 760mm high, often designated 760mm Hg.
  4. 1mol of an ideal gas in these conditions has a volume of 22.4Liters.
  5. STP is often used for measuring gas density and volume.

Step 2: Use the formula to show the way to calculate the standard temperature and pressure

The standard conditions calculations are based on the ideal gas law formula:PV=nRT,

The other equations that might be useful in calculating the STP situations are:

Gay-Lussac's law: P1T1=P2T2,
Charles's law: V1T1=V2T2 and
Boyle's law: P1V1=P2V2.


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