Nitrate salts (no3), when heated, can produce nitrites (no2) plus oxygen (o2). a sample of potassium nitrate is heated, and the 02 gas produced is collected in a 700 ml flask. the pressure of the gas in the flask is 2.7 atm, and the temperature is recorded to be 329 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 700 ml flask cools to a temperature of 293k. what is the new pressure due to the o2 gas?