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An Investigation of Fermentation in Yeast. Determination of Carbon Dioxide Produced

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I carried out the practical shown in the attachment, and am struggling with the calculations, Can anyone please explain what I need to do? As there are different calculations for different bits I am submitting separate post for each bit. Can anyone please show me how to determine carbon dioxide produced?

The model answers from the experiment are also attached (not my results but I am not asking for anyone to do my homework for me...just show me how to calculate).

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