hi phd girlie, never fear ur not stupid! Im just useless when it come to moles as well. as far as i know, u need to calculate the molar mass on one mole, so thats just the molecular weight of whatever substance u have, then u use this to find out what the relative mass of the amount of the substance is and thats ur molar mass.
eg, 5.380g of C6H12O6. molar mass of C6H12O6 is 180.0g/mol. ing 1 mol C6H12O6 = 180.0 g of C6H12O6, moles C6H12O6 = (5.380)*(1molC6H12O6/180.0g C6H12O6) = 0.02989mol C6H12O6.
hope that helps!
http://www.genscript.com/conversion.html
This might be of some help
It can take years to get used to certain calculations (some people can do them without thinking; most of us can't). I know elderly profs who confess to struggling and having to spend whole afternoons going over them. Better you ask for help than try to blag your way through - any supervisor who doesn't realise that is failing as a supervisor (and is a jerk).
There is a book (with a tile something likw Calculations for A-Level Chemistry) that I found really helpful. Unhelpfully I forget the exact name of it and I'm not in the lab this week, but next week I'll post the details, unless someone else can remember it.
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