Based on these two statements, what conclusion could dalton draw about the relative masses of oxygen and hydrogen atoms? how many times more massive is an oxygen atom than a hydrogen atom?

1- He reported that seven pounds of oxygen reacted with one pound of hydrogen to form water, but accurate modern experiments give eight pounds to one.

2- by determining the relative mass we will be able to determine for example that one element has twice the mass of a second element.

3-  oxygen atoms were found to have a mass 16 times greater than the mass of hydrogen 

Idon't see the pic?

Anions are negative charged ions