Homework Help: Chemistry(Please help, thank you)

Posted by Hannah on Monday, February 27, 2012 at 11:10pm.

I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the following equation.

2S2O3^2- + I2 -> 2I^- + S4O6^2-

Chemistry(Urgent, please help) - DrBob222, Sunday, February 26, 2012 at 9:47pm
If you know the number of moles of S2O3^2- then the number of mols I2 will be 1/2 that. I suspect you have M and L of S2O3^- and M x L = moles S2O3^2-.

Chemistry(Urgent, please help) - DrBob222, Monday, February 27, 2012 at 12:47am
moles = M x L

M is the concentration correct?

Chemistry(Please help, thank you) - Amanda Mosley, Monday, February 27, 2012 at 11:17pm
Yes m is
Chemistry(Please help, thank you) - Hannah, Monday, February 27, 2012 at 11:18pm
Is L just the unit? Moles would be 3.33e-3M / L ?
Chemistry(Please help, thank you) - Amanda Mosley, Monday, February 27, 2012 at 11:26pm
Yes u remember where it says mxL this means that your multiplying m by l and l would be the unit
Chemistry(Please help, thank you) - Hannah, Monday, February 27, 2012 at 11:41pm
So to find the amount of I2 produced as I first posted, it would be 1/2 that of 3.33e-3 correct? So 0.0666? Sorry, its important that I understand this correct
Chemistry(Please help, thank you) - Amanda Mosley, Monday, February 27, 2012 at 11:51pm
Yes i tried your question and this is what i recieved
Chemistry(Please help, thank you) - Hannah, Tuesday, February 28, 2012 at 12:11am
So the answer would be 6.66e-2 L*min? Is that the correct unit?
Chemistry(Please help, thank you) - Hannah, Tuesday, February 28, 2012 at 12:14am
Sorry I actually got 0.00666 so it would be 6.6e-3 correct?
Chemistry(Please help, thank you) - Hannah, Tuesday, February 28, 2012 at 12:19am
So I got 6.6e-3 L*min for the amount of I2 produced. Now I have to calculate the rate for each of the 5 flasks used, so is the answer going to be the same for all 5?? It says to calculate the rate of reaction for each run using # of moles of I2 produced/L*min as the unit.

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