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?

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

Which one of the following research methods can show cause and effect