Question

The maximum number of molecules is in
(A)36 g H2O
(B)28 g CO
(C)46 g C2H5OH
(D)54 g N2 O5

Answer 1

I think it should be a)

Answer 2

A is the answer.
Multiply Moles by the Avogadro Constant. Multiply the number of moles by the Avogadro constant, 6.022 x 10^23, to calculate the number of molecules in your sample.