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AQA A Level chemistry carboxylic acids

In a reaction to form biodiesel, one mole of a vegetable oil reacts with an excess of methanol to form two moles of an ester with molecular formula C19H34O2 and one mole of an ester with molecular formula C19H36O2
Draw the structure of the vegetable oil showing clearly the ester links.
You should represent the hydrocarbon chains in the form CxHy where x and y are the actual numbers of carbon and hydrogen atoms

How would you work this out please?
Work back from the esters. Take methanol from each ester to form carboxylic acids. The three carboxylic acids joined together by Ester links with glycerol gives the vegetable oil.
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