Decomposition of KClO3 lab

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1. Ignoring any side reactions and assuming the reaction occurs completely, how large (in kg) an oxygen candle (KClO3) would be needed to supply 8 people with enough oxygen for 24 hours on a small submarine? Although this depends on the size of the person and their respiration rate (activity), according to NASA, an average person needs about 0.84 kg of O2 per day.

2. At 1 atm and 25 degrees C, what would the volume of O2 be from the previous question?

3. Assuming that air is 21% O2 by volume, what volume of air would be needed to answer question2?

4. Assuming all of the analogous reactions occur, why would lithium chlorate be a more practical choice for the "chlorate candle" than either sodium or potassium chlorate?

I know how to do #1, I'm just having trouble with 2-4. I don't even necessarily need the answers, just help on how to do them. thank you!

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