The volume of the air if the temperature and pressure are changed to STP is 94.32mL.
The volume of a given gas can be calculated using the following formula;
P₁V₁/T₁ = P₂V₂/T₂
Where;
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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