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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: elcabin on December 17, 2007, 08:10:41 PM

Title: Question
Post by: elcabin on December 17, 2007, 08:10:41 PM

The density of sulfur vapor at 1273K and 740 torr is 0.5977 g/L. Its molar mass is __________.

Can someone guide me through this problem?

Title: Re: Question
Post by: Padfoot on December 17, 2007, 08:18:26 PM

How many moles of the vapour will be in 1 L?

Title: Re: Question
Post by: elcabin on December 17, 2007, 10:55:33 PM

22.4 moles ;D

Title: Re: Question
Post by: Padfoot on December 18, 2007, 06:34:26 AM

Quote from: elcabin on December 17, 2007, 10:55:33 PM

22.4 moles ;D

That's at STP.  It changes though - try using PV=nRT

http://en.wikipedia.org/wiki/Gas_constant

Title: Re: Question
Post by: AWK on December 18, 2007, 07:17:20 AM

rearrange the ideal gas law to
pM=dRT