How many moles of oxygen?

Question

Hi,

Que: Determine the number of moles of oxygen atoms in each of the following.

4.37 mol H2O2

I answered that the # of moles of oxygen is 2.185 (half of it) but apparently it is wrong...

Help!

Thank you!

Answer 1

The answer is - 8.74mol

Because - 1mol of H2O2 has 2mol Oxygen atoms.

               Therefore 4.37mol has - 4.37 x 2 = 8.74mol

Answer 2

sorry, you were close!  since the molecular formula of hydrogen peroxide is H2O2, it means there are two oxygen atoms in each molecule, and by extension, two moles of oxygen atoms in each mole of H2O2.  this means there should be 4.37mol H202 * (2molO / 1mol H2O2) = 8.74molO.  hope this helps, and good luck!

Answer 3

You were on the right tracks! but try thinking of it this way:

-1H2O2 is ONE MOLE of hydrogen peroxide.

-in every one mole, 2O is present.

-2O is TWO MOLES of oxygen

Overall, this means:

THERE ARE TWO MOLES OF OXYGEN FOR EVERY MOLE OF H2O2

therefore, you must DOUBLE rather than HALF

the answer is 4.37 x 2 = 8.72

(: