The reported number of moles will be too low since the additional amount of oxygen is not included. It may be 6 drops but the molarity of the solution is 6M. this meas that for every ml of the JNO3 solution there is 6 moles of JNO3. In every mole of JNO3 there are 3 moles of oxygen. So in every drop of oxygen there are 18 moles of oxygen.
