# How many grams of CO2?

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I wish to find how how many grams of CO2 are needed to enrich a room to 1500ppm. I've tried to work it out but cannot figure it out completely.

The dimensions of the room are 2.9m*1.9m*0.9m which equals 4.959m cubed rounded off to 5 cubic meters.

Then to find how many cubic meters of CO2 are needed this is multiplied by 0.0015

5*0.0015 = 0.0075 cubic meters of CO2 needed.

At a temperature of 25C and pressure of 100kPa 1 mole of a gas will occupy 24.79L.

1 mole of CO2 has a mass of 44 grams.

.0075 (cubic meters) = 7.5 liters

24.79L/7.5L = 3.3053 grams of CO2 needed?

This cannot be correct and I must have gone wrong somewhere could someone help put me on the right track?

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think BTU's are used in determining heating space and what device to heat determines CO2, if any.

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Could you take as a ratio of air to CO2? than have 1500(Co2) x (air)/1 mil check that answer out so that you get that = 1500ppm for X grams of CO2.

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• 4 weeks later...

the number of moles of CO2 in the room at 25 deg. C and approximately 1 bar - now multiply by the number of grams in a mole of CO2

By the way if you can't calculate something this simple I HOPE you aren't out there commenting on the effects of CO2 in the atmosphere ...

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MilesD - lay off it mate! Sometimes when theres lots of steps its a little confusing to do a calculation the first time. I remember I had all sorts of problems with moles calculations when I was studying A-level chemistry!

Perhaps it would be good to establish how many moles of gas there are in the room at first? I think this is what GutZ said too

Matt

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Don't forget that you don't start from zero ppm CO2.

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