Homework Help: Chemistry

Posted by Randy on Sunday, October 25, 2009 at 9:32pm.

Hey guys, been a long time since I have done this. Please show your work. Thanks a lot!

How many grams do 3.6 × 10^20 atoms of sodium weigh?
Answer in units of g

Chemistry - DrBob222, Sunday, October 25, 2009 at 9:41pm
The molar mass of Na is approximately 23. You can look up the exact number.
23.0 grams Na will contain 6.022 x 10^23 atoms Na. So
3.6 x 10^20 atoms Na x (1 mole Na/6.02 x 10^23 Na atoms) x (23 g Na/1 mole Na) = ??

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