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States of Matter question

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Borek:
You don't need partial pressures.

This is a simple stoichiometry: if one mole of SO2 reacts, by how many moles does the number of moles of the mixture change?

milani:
Sorry, i am still a bit confused. Could you please explain the steps to get to the final answer?

Borek:
Answer the question I asked.

milani:
if one mole of SO2 reacts, by how many moles does the number of moles of the mixture change?
1?

I have found the initial moles of the reaction and the moles of SO3 in the end as well.

Borek:

--- Quote from: milani on October 13, 2021, 12:13:20 PM ---1?
--- End quote ---

This is not something to guess, you can calculate from the reaction equation.

Assume you have initially - say - 1 mole of SO2 and 5 moles of O2. There is an excess of oxygen. How many moles of both gases together?

Now reaction proceeds to the end. 1 mole of SO2 reacted, there is none left. How many moles of SO3 were produced? How many moles of O2 left? How many moles of both gases together?

What is the difference?

Does this difference depend on the number of moles of SO2 that reacted? If you are not sure - do identical calculations for an initial mixture of 0.5 moles SO2 and 5 moles of oxygen. For 2 moles SO2 in 5 moles of oxygen. Actually any number of moles of SO2 in excess number of moles of oxygen. Do you see a pattern here?

If so, knowing how many moles of the mixture were present the reaction and after the reaction, can you calculate how many moles of SO2 were present initially in the mixture?

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