February 26, 2017

Homework Help: chemistry

Posted by Christy on Wednesday, February 4, 2009 at 9:18am.

How do you calculate the % empty sapce in 100mL of air. Using Avogadro's number(6.02x10^23) and the average volume of O2 and N2(3.8x10^-24 cm3/molecule). I think you can use the ideal gas law but am not really sure how to do it.
I also have a similar question to fund the % empty space in 1 mole of water at 25 degree C(d=0.9971g/ml). The volume of a water molecule can be taken as the sum of the volumes of the 2 hydrogen molecules and the oxygen atom. Using the single bonded covalent radii of 37pm for hydrogen and 66pm for oxygen.
I am really stuck and posted it 2 times. Please help me.Thanks

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