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After a few hours the 740 ml flask cools to a temperature

Nitrate salts (NO₃^-), when heated, can produce nitrites (NO₂^-) plus oxygen (O₂). A sample of potassium nitrate is heated, and the O₂ gas produced is collected in a 740 mL flask. The pressure of the gas in the flask is 2.9 atm, and the temperature is recorded to be 317 K. The value of R= 0.0821 atm L/(mol K)

How many moles of O₂ gas were produced? moles

After a few hours, the 740 mL flask cools to a temperature of 293K. What is the new pressure due to the O₂ gas?

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