Homework Help: Chemistry

Posted by Brittany on Sunday, November 4, 2012 at 8:15pm.

Which one of these samples contains the smallest number of molecules?

a.
1.0 L of H2 at STP (0°C and 1atm)
d.
1.0 L of N2 at 0°C and 800 torr
b.
1.0 L of N2 at STP
e.
1.0 L of He at STP
c.
1.0 L of H2 at 20°C and 760 torr

Chemistry - DrBob222, Monday, November 5, 2012 at 12:12pm
I suppose the simplest thing to do is to calculate the number of mols of each although 1.0 L at STP will give the same number of mols no matter which gas is used.
PV = nRT

You can use reasoning if you wish. Note that n = PV/RT so when T is greater than standard T n will be greater and when P is larger than standard you know n will be larger. I figure the smallest one will be either c or d.
Chemistry - Anonymous, Monday, May 20, 2013 at 11:18am
hjojp

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