Question

If 59.3 grams of potassium chlorate decomposes, how many grams of oxygen gas can be produced?

2 KClO3 → 2 KCl + 3 O2

Answer 1

@hartnn

Answer 2

How many more oxygen atoms are there before and after it decomposes?

Answer 3

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Answer 4

Start with the given, second ratio is the conversion to moles, then use mole ratio from the balanced equation to get to moles oxygen, then the 4th ratio is converting moles oxygen to grams.
You are left with grams oxygen.
Just multiply all the top numbers, and divide all the bottom numbers. The units all cancel leaving grams oxygen.