Okay, so I'm a novice in chemistry and am trying to figure something out.
Say that you want to turn carbon dioxide into oxygen using photosynthesis, given an infinite supply of water. Say that the atmosphere's volume is 100km^3 and has a pressure of 5kPa. The current composition of the atmosphere is 90% Carbon Dioxide, 5% Argon, 5% Nitrogen. You want to get the Oxygen in the atmosphere to the point that it's at 20% of the atmospheric composition. How would you calculate the atmospheric composition after you do that?
A step by step guide with just formulas would be fine, you don't necessarily have to solve this exact problem; I just need to figure out how you go about solving it. I'm only asking because when I tried doing the math and putting it back into a percent via # mols or their mass, I thought that in the end it should still have 5% Argon and 5% Nitrogen in the atmospheric composition since the chemical equation is only using the Carbon Dioxide in the air to make Oxygen.
Keep in mind when explaining it to me that I've only just completed my first semester of college chemistry, so make sure you tell me what each variable is!