Re: Pinhole Digest #1004 - 09/09/02

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From: George Fosselius (fosselg@albany.k12.ca.us)
Date: Tue Sep 10 2002 - 08:59:33 PDT 

Message-ID: <002d01c258e3$0e896120$1a9884d1@albany.k12.ca.us>
From: "George Fosselius" <fosselg@albany.k12.ca.us>
Subject: Re: Pinhole Digest #1004 - 09/09/02
Date: Tue, 10 Sep 2002 08:59:33 -0700

1. Does anyone know the density of carbon dioxide gas and of air?

Molar mass of CO2 is 12+2(16)=44 g
A mole of gas at std temp and pressure is 22.4 liters
at room temp slightly more (PV=nRT)
Density is g per liter for gas (isn't it usually?)

density of air would be weighted average of the molecules
N2 at 28 is 80%
O2 at 32 is 20&
.80*28+.20*32= about 29g per mole
divide by 22.4 for g per liter
George
"old teachers never die; they just lose their faculties"

----- Original Message -----
From: <HONGSTARS@sbcglobal.net
> 1. Does anyone know the density of carbon
> dioxide gas and of air?
> Hong Tran
> Westlake Middle School
> Oakland

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