Dimensional Analysis?

Question

how do you find it?
I need to know the Mass in grams of CO2
can you also show me the steps
THANKS

Answer 1

Dimensional analysis is easier than it first seems.

First you need to know the molecular weight of CO2.

Carbon +2(Oxygen) = 12 + 2(16) = 44 grams per mole

[The above step is not dimensional analysis.]

Let's say somebody asks you how many moles 440 grams of CO2 is.

This is where we do dimensional analysis.

(1 mole CO2 / 44 grams CO2) * (440 grams CO2 / ? CO2)

The / sign indicates "divided by", so imagine the parts over each other. That makes it easier but I cannot do it here in text.

The first part of the above equation is stating that for every mole of CO2, there are 44 grams of CO2. The second part says that we have 440 grams of CO2, and want to find out how many moles we have.

The trick here is to have the terms, one above the other, so that the units cancel out and you end up with the desired unit. Our desired unit here is the mole - we want to know how many moles are in 440 grams of CO2. So, that is why in the above, (1 mole CO2) is on top of (44 grams CO2). If we allow 440 grams to be on top in the next term, then grams cancels out, and moles is the only unit left. This is what we want.

So if we solve the above

(1/44)*(440/1) = 440/44 = 10 moles of CO2.

So, 440 grams of CO2 is the same as 10 moles of CO2.

hope this helps

yay

Answer 2

I assume you want to know what a mole of CO2 is?
12+2*16=44 grams

Answer 3

You must post the question about grams of CO2. Then we'll put up the answer, showing you how to do it according to dimensional analysis, which is a fancy name for the factor-label system.

Answer 4

Sure Thing

You want to find the mass of a single CO2 molecule (grams). While the periodic table describes the mass of C & O in grams per mol.

So if you add the mol mass of C(12.01) and O (16.00)*2 you get 44.01 grams per mol. Since one mol equals 6.023x10^23. divide 44.01 by that number and you cancel the mols term cancels are only left with grams. The final number is your mass of CO2. Hope that helps

Answer 5

Molecular wt is simply the sum of the atomic wts of the elements present.

For CO2, MW = 1 x AW of C (12.01) + 2 x AW of O (16) = 44.01