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Originally posted by sjnyongle at 2010-11-15 17:45:32:
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[ Last edited by gzgzgz on 2010-11-17 at 08:55 ]
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Av=6.02*1E-23
MW =  molecular weight, for example:  CH4 = 16 g/Mol
No. of molecules in 0.001 g = (0.001*Av/MW)
1mL = (0.01*1E10)^3 = 1E-24 Ang^3
n = (0.001*Av/MW) / (1E-24) = (1E21*Av/MW)   

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Originally posted by ϯÔµ÷ÇÙ at 2010-11-28 20:13:24:
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