The answer is: 22 hydrogen atoms.
___________________________________
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.
_________________________
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.
_________________________________________