Homework Help: PLEASE HELP: Chemistry

Posted by kathryn on Thursday, October 14, 2010 at 9:38pm.

How many atoms of element "R" are present in 55.80 g of (AH3)4(R2O3)4 (molar mass = 478.17 g/mol)?

Please help. I've tried going (g of molecule/mol)x(1 mol of molecule/ 55.80g)but I'm not really sure what to do with this.

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