posted by Nae .
How many moles of O atoms are there in a sample of 86g sucrose (C12H22O11)?
College Chem -
342 grams/mol (add up 12C +22H +11O)
86/342 = .251 mol
for every mol of sucrose there are 11 moles of O
11*.251 = 2.77 mol of O