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March 27, 2015

March 27, 2015

Posted by **Samantha** on Saturday, December 15, 2012 at 8:18pm.

density is mass/volume so how do i get those from what i am given?

also

) Calculate the molar mass of a vapor that has a density of 6.735 g/L at 11°C and 743 torr.

- science -
**Rylee**, Saturday, December 15, 2012 at 8:49pmMolar mass SF6 = 146.06 g/mol

p = 723 / 760 = 0.951 atm

T = 31 + 273 = 304 K

d = M p / RT = 146.06 x 0.951 / 0.0821 x 304 = 5.57 g/L

M = d x RT/ p

T = 14 + 273 = 287 K

p = 825 / 760 = 1.09 atm

M = 7.535 x 0.0821 x 287 / 1.09 = 162.89 g/mol

Hope this helps :)

- science -
**Samantha**, Sunday, December 16, 2012 at 11:03amthanks!!!

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