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October 30, 2014

Homework Help: chemistry

Posted by s on Sunday, December 14, 2008 at 11:08pm.

are these right?

How many atoms are there in 1.3x10^22 molecules NO2?

atoms=(1.3x10^22 molecules NO2) x (2atoms/1molecule) = 2.6x10^22 atoms NO2


A 5.0g sample of O2 is in a container at STP. How many atoms of oxygen are in the container?

atoms = (5.0g O2) x (1mol/32g)x (6.02x10^23 molecules/1mol) x (2atoms/1mol) = 1.9x10^23 atoms O2

thanks

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