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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.