Username123455
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titration question says to work out relative atomic mass from molar mass (gmol^-1) how would i do that?
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GabiAbi84
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What’s the full question?
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Levi.-
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(Original post by Username123455)
titration question says to work out relative atomic mass from molar mass (gmol^-1) how would i do that?
Isn't it just mass/moles
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Username123455
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(Original post by GabiAbi84)
What’s the full question?
4. Calculate the amount, in mol, of X2CO3 present in the 250 cm3 solution that you prepared.
5. Calculate the molar mass, in g mol–1, of X2CO3.
6. Calculate the relative atomic mass of X
These all link together, im really stuck here
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Username123455
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(Original post by Levi.-)
Isn't it just mass/moles
I've done that but got 0.1041 for the molar mass, how would i get relative atomic mass.
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GabiAbi84
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(Original post by Username123455)
I've done that but got 0.1041 for the molar mass, how would i get relative atomic mass.
So you have the molar mass of X2CO3, yes?

Now they are looking for you to find out the relative atomic mass of X
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Username123455
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(Original post by GabiAbi84)
So you have the molar mass of X2CO3, yes?

Now they are looking for you to find out the relative atomic mass of X
But how do you do that lol
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GabiAbi84
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(Original post by Username123455)
But how do you do that lol
Firstly -the number you have for the molar mass seems too low. If you could add in the first two parts to the question that would help.

But basically you have the weight of the molecule, now you’re looking to calculate the weight of the atom X.


So for CH4 - the molar mass is

Atomic mass of C 4*atomic mass of H
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Username123455
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(Original post by GabiAbi84)
Firstly -the number you have for the molar mass seems too low. If you could add in the first two parts to the question that would help.

But basically you have the eight of the molecule, now you’re looking to calculate the weight of the atom X.


So for CH4 - the molar mass is

Atomic mass of C + 4*atomic mass of H
1. Calculate the mean titre using your concordant results.
2. Calculate the amount, in mol, of HCl in your mean titre.
3. Using the equation above, calculate the amount, in mol, of X2CO3 used in the titration.
These are the first parts, yeah I thought that too.
mean titre is 21.13 and mass of X2CO3 is 1.1.
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GabiAbi84
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What’s your concentration of HCl ?
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Username123455
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(Original post by GabiAbi84)
What’s your concentration of HCl ?
0.100 mol dm–3
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GabiAbi84
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(Original post by Username123455)
0.100 mol dm–3
Okay you’ve done something wrong in your calculations somewhere.

What answer did you get for part 2?

And for part three it says using the equation above-what’s the equation?
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Username123455
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(Original post by GabiAbi84)
Okay you’ve done something wrong in your calculations somewhere.

What answer did you get for part 2?

And for part three it says using the equation above-what’s the equation?
i got 2.113 mols
X2CO3(aq) + 2HCl(aq)  2XCl(aq) + H2O(l) + CO2(g)
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GabiAbi84
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(Original post by Username123455)
i got 2.113 mols
X2CO3(aq) + 2HCl(aq)  2XCl(aq) + H2O(l) + CO2(g)
Okay so first -when you do your mole calculation you need to convert the cm3 into dm3 by dividing by 1000.
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(Original post by GabiAbi84)
Okay so first -when you do your mole calculation you need to convert the cm3 into dm3 by dividing by 1000.
omg lol forgot about that, thank you so much for your help!
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