Homework Help: science

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

Calculate the density of sulfur hexafluoride gas at 703 torr and 23°C.

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 8:49pm
Molar 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 11:03am
thanks!!!

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