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/sci/ - Science & Math

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[ERROR] No.3762314 [Reply] [Original]

Hey, /sci/, doing a practice chem exam here. How do I solve this type of problem? I assume there is some grams to mole conversions I'll need to do, but then what?

"If 152 g SO2 escaped into the atmosphere and all the escaped SO2 were converted to H2SO4. How many grams of H2SO4 would be produced in the atmosphere?"

>> No.3762373

g SO2 --> mol
mol ratio between SO2 & H2SO3
mol --> g

>> No.3762377

>>3762373
*H2SO4

>> No.3762389

>>3762373

This.

Each SO2 is converted into one H2SO4, so you find the number of SO2 molecules in 152 grams of SO2 and then find the mass of that many H2SO4 molecules.

Works with moles instead of molecules too.

>> No.3762415

>>3762373

So 152 grams of SO2 converted to moles is about 2.3726, right? And the mole ratio between the two is 1/1, I believe. So then do I multiply 2.3726 by the mass of H2SO4 (98.0791 g/mol)? Would it be 232.7025 grams of H2SO4 or am I completely doing this wrong?

>> No.3762450

>>3762415

That's correct, bro.

Just checked it on Wolfram Alpha, by the way.
> http://www.wolframalpha.com/input/?i=152+grams+of+SO2
> http://www.wolframalpha.com/input/?i=2.37+mol+of+H2SO4
Input "152 grams of SO2" and it returns 2.37 moles, and then input "2.37 moles of H2SO4" and it returns 0.232 kilograms.

Not sure if you can have it do this whole problem in one step.

>> No.3762453
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[ERROR]

>>3762415
I am sorry I am too lazy to check the actual numbers but from your words you are doing it 100% correct. Just write every ratio you have (such as "grams per mole") as a fraction, and as you multiply across intermediate units will cancel to leave you with grams. Ex.] X g/mol * Y mol/spongecake will leave you with XY grams per spongecake as the mole units cancel each other out.

>> No.3762483

>>3762450

Alright, thanks. And I think I'll be using that site now for some of these longer problems.

>> No.3762504

>>3762483

It's a pretty useful tool, especially in the way it interprets normal English, but it might not work if you try anything too complicated. I find it most useful for solving integrals, doing normal calculator shit, and looking up unit conversions and physical constants.

>> No.3762514

>>3762504

Can it do percent/theoretical yield or anything like that?

>> No.3762536

>>3762514

Not sure. There's no harm in trying it though

>> No.3763132

Alright, so there's another one I apparently don't know how to do:

"Silver nitrate reacts with calcium chloride to produce silver chloride and calcium nitrate. What mass of silver chloride can be formed from 42.6g of calcium chloride?"

I wrote the equation as AgNO3 + CaCl2 = AgCl2 + CaNO3 and converted calcium chloride into moles (0.384). Now I'm stuck. What next?

>> No.3763147

Protip: AgCl2 and CaNO3 do not exist. What charges to Ag and Ca commonly have in ionic compounds?

>> No.3763175

>>3763147

Oookay, so then the formula should be 2AgNO3 + CaCl2 = 2AgCl + Ca(NO3)2

Then, the ratio is 1/2 and the answer is 110 grams of AgCl, right?