a 100.0 ml sample of air is collected at 21 oc and 772 mmhg. what will the volume be if the temperature and pressure are changed to stp?



Answer :

The volume of the air if the temperature and pressure are changed to STP is 94.32mL.

How to calculate volume?

The volume of a given gas can be calculated using the following formula;

P₁V₁/T₁ = P₂V₂/T₂

Where;

  • P₁, V₁ and T₁ are the initial pressure, volume and temperature respectively.
  • P₂, V₂ and T₂ are the final pressure, volume and temperature respectively.

According to this question, a 100 mL sample of air is collected at 21°C and 772mmHg. The volume if the temperature and pressure are changed to STP can be calculated as follows:

772 × 100/294 = 760 × V/273

262.585034 × 273 = 760V

V = 71,685.7143 ÷ 760

V = 94.32mL

Therefore, 94.32mL is the volume of the gas at STP.

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