Answer : To determine the mass of oxygen in the compound produced in the virtual lab, it should be weighed and subtracted from the total weight of the compound. The mass pf each element can be used to determine the empirical formula of the compound by finding out the molar ratios of the individual elements present in the compound. Molar ratios can be obtained by dividing elements by atomic masses of individual elements.
One has to spot the smallest moles of the elements present in the compound and then it has to be divided by rest of the elements in the compound to find the empirical formula of that compound.
You can determine its weight by simply weighing it. Then, you use the mass to divide to the empirical molar mass. This is done by getting the molar ratio of the individual elements within that compound. Use the least amount of moles of the elements and divide it with the rest. Then, you'd get the empirical formula.
Reduced is the right answer. You can remember it like that if it gains electron that means it will turn negative or will get reduced nuber. So itis reduction Ihope it will help:)
