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# What Mass of CO2 is produced when 35g of Calcium Carbonate is Decomposed watch

1. (Original post by ItsUmzy)
2.27*10^-4)*6=1.362*10^3
then would i times it by (CO =12+16)???
Yep.
2. (Original post by HAnwar)
Yep.
i get 0.038136? x 1000???
and would that be right?
3. (Original post by ItsUmzy)
i get 0.038136? x 1000???
and would that be right?
You don't need to times it by 1000 as you already converted it earlier on.
So your final answer is 0.038136. You might want to round it.
4. (Original post by HAnwar)
You don't need to times it by 1000 as you already converted it earlier on.
So your final answer is 0.038136. You might want to round it.
Ohhh... Thats not a lot of Carbon Monoxide is it... Someone told me it was 740kg haha
5. (Original post by ItsUmzy)
Ohhh... Thats not a lot of Carbon Monoxide is it... Someone told me it was 740kg haha
Ohhhhh I know what you did. You did 227/1000000! It's meant to be the other way round lol
6. (Original post by HAnwar)
Ohhhhh I know what you did. You did 227/1000000! It's meant to be the other way round lol
****.... this changes everything,
so then 4405.286344*6
and then times 28?
and then /1000
7. I'll post my answer, once you have arrived to it yourself.
(I was also waiting for someone else to say it too, to make sure i wasn't wrong. I did make some silly mistakes, but I'm now sure in my answer.)
8. (Original post by ItsUmzy)
****.... this changes everything,
so then 4405.286344*6
and then times 28?
and then /1000
Lol don't worry. You learn from making mistakes

Yep the method would be the same after that.

What do they want the final answer in, grams or kg?
If they want it in grams then you leave it as it is. If you want it in kg, then divide by 1000.
9. (Original post by ItsUmzy)
****.... this changes everything,
so then 4405.286344*6
and then times 28?
and then /1000
Just need to times the 4405.3 by 6.

Look at the answer afterwards, and see if it makes sense.

Edit#1: Actually, one moment.

10. (Original post by ItsUmzy)
Thanks!
How would i do it for
WHat mass of Carbon Monoxide is produced when 1000kg of TNT

2 C7 H5 (NO2)3 -> 12CO+5 H2+ 3 N2 + 2 C

By the way, say if anything doesn't make sense, because I nearly made a number of mistakes, having not done really any chemistry for a while.

n = m/M because we have the mass of TNT, and can figure out the relative molecular mass.
n = 1000kg x 1000 (must make it into grams) / 7(12) + 5(1.01) + 3(14) + 6(16)
n = 4404.3

Ratio of 2 C7H5(NO2)3 to 12 CO
2:12
So 4404.3. is multiplied by 6 = 26425.9

m = nM (or n x M)
m = 26425.9 x (12 + 16)
m = 475666.2g/1000 (back into kilograms)
m = 475.7kg

HAnwar Double check this for me please! It'd be awful to give a wrong answer.
EDIT #1: By the way, if the answers are slightly different, that's because I've rounded it at parts.
11. (Original post by XcitingStuart)
By the way, say if anything doesn't make sense, because I nearly made a number of mistakes, having not done really any chemistry for a while.

n = m/M because we have the mass of TNT, and can figure out the relative molecular mass.
n = 1000kg x 1000 (must make it into grams) / 7(12) + 5(1.01) + 3(14) + 6(16)
n = 4404.3

Ratio of 2 C7H5(NO2)3 to 12 CO
2:12
So 4404.3. is multiplied by 6 = 26425.9

m = nM (or n x M)
m = 26425.9 x (12 + 16)
m = 475666.2g/1000 (back into kilograms)
m = 475.7kg

HAnwar Double check this for me please! It'd be awful to give a wrong answer.
EDIT #1: By the way, if the answers are slightly different, that's because I've rounded it at parts.
im getting 26425.9*28= 739925
/1000
740kg!
12. (Original post by XcitingStuart)
By the way, say if anything doesn't make sense, because I nearly made a number of mistakes, having not done really any chemistry for a while.

n = m/M because we have the mass of TNT, and can figure out the relative molecular mass.
n = 1000kg x 1000 (must make it into grams) / 7(12) + 5(1.01) + 3(14) + 6(16)
n = 4404.3

Ratio of 2 C7H5(NO2)3 to 12 CO
2:12
So 4404.3. is multiplied by 6 = 26425.9

m = nM (or n x M)
m = 26425.9 x (12 + 16)
m = 475666.2g/1000 (back into kilograms)
m = 475.7kg

HAnwar Double check this for me please! It'd be awful to give a wrong answer.
EDIT #1: By the way, if the answers are slightly different, that's because I've rounded it at parts.
Yeah I think you rounded or something because you got 4404.3, I got 4405.3.
That lead you to getting 26425.9 while I got 26431.7.

But you then did 26425.9 x (12+16), and that doesn't give you 475.7.

My answer if you convert back to kg is 740.

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13. (Original post by ItsUmzy)
im getting 26425.9*28= 739925
/1000
740kg!
Yes, that's correct.

I actually got that one of the multiple times I calculated it, but then I thought I made a mistake, and redone it.

On a side note, that's the beauty in showing all your workings, because in an exam you can realise far quicker where you have gone wrong.
14. (Original post by ItsUmzy)
im getting 26425.9*28= 739925
/1000
740kg!
You got it? Awesome!
15. (Original post by ItsUmzy)
im getting 26425.9*28= 739925
/1000
740kg!
I would rep again, if it wasn't for PRSOM.

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