stoichiometric coefficients

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Fdonovan 3D
Posts: 101
Joined: Sat Aug 17, 2019 12:16 am

stoichiometric coefficients

Postby Fdonovan 3D » Mon Mar 09, 2020 2:58 pm

For the reaction 3/2 O2 -> O3, why do we use the stoichiometric coefficient of 3/2? Would it still be correct if we multiply both sides by 2, or is that not the simplest form of the equation?

105311039
Posts: 107
Joined: Fri Aug 02, 2019 12:16 am

Re: stoichiometric coefficients

Postby 105311039 » Mon Mar 09, 2020 2:59 pm

the reaction is correct either way. You can multiply by 2 if you want.

MAC 4G
Posts: 121
Joined: Wed Sep 18, 2019 12:16 am

Re: stoichiometric coefficients

Postby MAC 4G » Mon Mar 09, 2020 3:25 pm

Both are correct as mentioned above, and I don't think you'd lose points for having either. Typically we haven't really left coefficients in fractions, at least on exams and tests.

Caroline Zepecki
Posts: 101
Joined: Fri Aug 09, 2019 12:16 am

Re: stoichiometric coefficients

Postby Caroline Zepecki » Tue Mar 10, 2020 11:58 am

It's correct whether in fraction or whole number form, because the equations we use relate the two in ratio form anyways.

MeeraBhagat
Posts: 95
Joined: Sat Aug 24, 2019 12:15 am

Re: stoichiometric coefficients

Postby MeeraBhagat » Tue Mar 10, 2020 11:18 pm

The reason it was in fraction form was because the first step of the reaction wanted to be written to get exactly one mole of product just to make it simpler. Therefore, to make this happen, there needed to be 1/2(O2) as a reactant. If you had started with 1 mole O2 then you would end up with 2 moles O3 in the end.

Robert Tran 1B
Posts: 118
Joined: Thu Jul 11, 2019 12:15 am

Re: stoichiometric coefficients

Postby Robert Tran 1B » Tue Mar 10, 2020 11:55 pm

Either way works, but the reaction is written with the fraction so that the coefficient of the product is one.

WesleyWu_1C
Posts: 117
Joined: Thu Jul 25, 2019 12:16 am

Re: stoichiometric coefficients

Postby WesleyWu_1C » Wed Mar 11, 2020 12:28 am

Sometimes you want one of the species in your equation to be 1 mol, which is why other species have fractions as coefficents.

Zoe Gleason 4F
Posts: 51
Joined: Tue Jul 23, 2019 12:15 am

Re: stoichiometric coefficients

Postby Zoe Gleason 4F » Wed Mar 11, 2020 12:30 am

Either way is correct, but if you wanted to answer a question with one mol of O3, then you can use the reaction with 3/2 to make it simpler.

kevinolvera1j
Posts: 103
Joined: Fri Aug 02, 2019 12:15 am

Re: stoichiometric coefficients

Postby kevinolvera1j » Fri Mar 13, 2020 3:31 pm

Using a fraction is useful if you only want the product to have 1 mol in your equations.

Madelyn Romberg 1H
Posts: 102
Joined: Tue Oct 02, 2018 12:16 am

Re: stoichiometric coefficients

Postby Madelyn Romberg 1H » Sat Mar 14, 2020 10:16 am

This shows the standard reaction where you want to get exactly one mole of product, which means we use fractions for the reactants if needed.


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