The answer is: 22 hydrogen atoms.
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Carbohydrates, including sugar, have a ratio of:
CₙH₍₂ₙ₎Oₙ ; so the number of hydrogen atoms will always be double the number of oxygen atoms; the number of oxygen atoms will be always equal; the number of carbon atoms; the number of hydrogen atoms will always be be double the number of hydrogen atoms.
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So, we are given: "a sugar compound has 11 oxygen atoms"; we know the compound will have twice that amount of hydrogen atoms; or, 11 * 2 (hydrogen atoms); or, 22 hydrogen atoms.
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