Using the equation: 2POCI, (aq) + 2PCis (aq) + O2 (aq) What is the effect on concentration if O2(g) is added to the above
reaction?

This is a bit confusing, the trial figures are all pretty close but the expected value seems to be around 15 times bigger than the trial figures found. this doesn't look like the range of values normally set in math problems. are the trial figures you give actually the differences found? if so the percentage differences are 6.92%, 6.29% and 7.55%,