Please help! Keep getting this problem wrong! The molecular mass is correct, how

Question

Please help! Keep getting this problem wrong! The molecular mass is correct, however the uncertainty is incorrect.
Other incorrect answers I have gotten for uncertainty are: .000342 .0003 .001 48.7442 1 Print-Caalalor Periodic Table Map Determine the molecular mass and its uncertainty for CHjCH,COOHNote: Significant figures are graded for this problem. To avoid errors, do not round your answers until the very end of your calculations and use the atomic masses given in the table to the right Element Atomic Mass 100794 ± 7 12.0107 ± 8 15.9994 ± 3 74.079 g/ mol | ± .000342 g/mol 0 partners privacy pslicy terms of use contact us hetp 5 8

Explanation / Answer

First on addin the uncertainities of invidual masses

MH = 1.00794 + 0.00007 = 1.00801

MC = 12.0107 + 0.0008 = 12.0115

MO = 15.9994 + 3 = 15.9997

MCH3CH2COOH = 3(12.0115) + 6(1.00801) + 2(15.9997)

= 36.0345 + 6.04806 + 31.9994

= 74.08196

Uncertainity = 74.08196 - 74.079

= 0.00296

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