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Newbie

Joined: 14 Oct 2018
Posts: 1

# Analytical Chem Uncertainty Problem- Time Sensitive!

I've been struggling with this question for a while.

Calculate the molar mass of diethyl ether, CH3CH2OCH2CH3. (C = 12.0106 +/- 0.0010, H = 1.00798 +/- 0.00014, O = 15.9990 +/- 0.0008)

The molar mass isn't an issue for me, but the uncertainty is giving me trouble. I've tried absolute error, as it's additive (taking into consideration the ratios of the molecules) but that didn't work.

The error is apparently +/- 0.004 g/mol, but I still have no idea how to get there.

Distinguished Member

Joined: 27 Sep 2017
Posts: 279
Location: Berlin, Germany
 The highest value is important. You have 4 Carbons, what means +-0,001 times 4 is +-0,004 g/mol Hydrogen is 10 times +- 0,00014 = 0,0014 g/mol and oxygen one time +-0,0008 g/mol So the error is +-0,004 g/mol max/min
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