# Chemistry

posted by Marissa

When coal is burned, the sulfur it contains is converted into sulfur dioxide. This is SO2 is a serious pollutant, so it needs to be removed before it escapes from the stack of a coal fired plant. One way to remove the SO2 is to add limestone, which contains calcium carbonate, CaCO3, to the coal before it is burned. The heat of the burning coal converts the CaCo3 to calcium oxide, CaO. The calcium oxide reacts with the sulfur dioxide in the following reaction:
2CaO+2SO2+O2=2CaSO4
The solid calcium sulfate does not escape from the stack as the gaseous sulfur dioxide would. What mass of calcium sulfate forms for each 1.00 Mg (Megagram) of SO2 removed by this technique?

1. Ms. Sue

Joe/Jimmy/Marissa -- please use the same name for all of your posts.

2. DrBob222

Ms. Sue is right. You get faster and better help if you don't change screen names.
2CaO + 2SO2 + O2=> 2CaSO4
mols SO2 - 1E6/molar mass SO2 = ?
Using the coefficients in the balanced equation, convert mols SO2 to mols CaSO4.
Now convert mols CaSO4 to grams. g CaSO4 = mols CaSO4 x molar mass CaSO4.

3. Kitty A

How do you know she/he changed screen names. ALSO: To "Marissa". Ms. Sue is correct. If you did change screen names, that's a problem because you seem to be both a boy and a girl which may confuse people and distract them from answering. (Joe & Jimmy are boy names and Marissa is a girl name)

4. DrBob222

It seems several students think by using both boys and girls names we will think they are different people. Not so. How do we know the same person is using different screen names. Easy. The IP address, which shows when the question/response is posted, tells us the computer being used. We can also tell where it is in most cases.

5. Marissa

Sorry were working in a group and not everyone has the same questions and so we know who's question is which
sorry for the confusion !

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