Homework Help: Chemistry

Posted by Angeline on Monday, April 20, 2009 at 5:35pm.

A few questions...how many grams are in 48.7x10^24? I don't know how to convert atoms to grams. I can do moles to grams or moles to atoms, but not atoms to grams. My other problem is how do you convert moles to moles as in "how many moles of Cu2O are needed to produce 2.3 moles of Oxygen gas?" The answer is two according to my friend, but I want to know how they reached this. Thanks for your help.

Chemistry - GK, Monday, April 20, 2009 at 7:26pm
Convert the number of atoms to moles by dividing by 6.02x10^23 atoms/mole.
Once you have the number of moles, you multiply by the formula mass ( grams/mole) to get the number of grams.
Chemistry - Angeline, Monday, April 20, 2009 at 9:04pm
Would the answer then be 971.57 grams?

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