1. A CHE 100 student lost some residue before recording the final mass. How migh
ID: 548381 • Letter: 1
Question
1. A CHE 100 student lost some residue before recording the final mass. How might it affect th experimental oxygen percent? Reason. A CHE 100 student did not heat the sample enough. How might it affect the experimental oxygen percent? Reason. 2. Complete the given equations for decomposition of the two salts which decompose on heating to their chlorides and oxygen similar to KCIO 3. (a) Mg(CIO). (s) (b) NaC103 (s) 4. Calculate % oxygen by mass in Mg(C103). }) A 2.50 g sample of Mg(CIO), was heated to a constant mass of 1.34 g. Calculate experimental 96 oxygen by mass in the compound. 5. 6, Calculate % error in percent oxygen using your answers in question # 4 and 5.Explanation / Answer
1. From what I understand about this experiment from the very limited information available, is that this seems to be an experiment where the difference between the weights of initial sample and the final residue after heating gives the amount of oxygen present in the sample. Now if a student loses some residue before recording the final weight, the difference in weight will be more than the actual value thus giving a false reading of increased amount of oxygen present in the original sample.
2. If a student does not heat the sample enough, not all oxygen will escape from the sample and the residue will have more weight than expected. this will lead to decrease in the difference of weight thus giving a false reading of decreased amount of oxygen present in the original sample.
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