Search found 35 matches

by anto007
Mon Feb 21, 2022 3:02 am
Forum: Chemistry forum
Topic: Determine the composition of a gaseous mixture
Replies: 0
Views: 19041

Determine the composition of a gaseous mixture

Hi everyone, would you help me understand how to set up the resolution of this exercise: "Calculate the composition of a gaseous mixture of C3H8 and C4H10 and the excess combustion air knowing that the flue gas has the following composition: CO2: 10.76%, H2O: 13.75%, O2: 1.76%, N2: 73.73%."...
by anto007
Thu Oct 28, 2021 4:15 am
Forum: Chemistry forum
Topic: Determine the equilibrium constant
Replies: 10
Views: 4252

Re: Determine the equilibrium constant

:lol: :lol: thanks
by anto007
Thu Oct 28, 2021 3:06 am
Forum: Chemistry forum
Topic: Determine the equilibrium constant
Replies: 10
Views: 4252

Re: Determine the equilibrium constant

I think it's just a minor oversight. You seem to have left your reaction at the "midway" point, because most equations that contain negative coefficients result in some kind of mistake or incorrect answer due to the initial reaction not being properly or fully balanced. The first equation...
by anto007
Sun Oct 24, 2021 9:10 am
Forum: Chemistry forum
Topic: Determine the equilibrium constant
Replies: 10
Views: 4252

Re: Determine the equilibrium constant

Could you please give me another hint? It's an electrochemistry exercise, I've divided the reaction into two half-reactions: R: 2Fe{3+} +2e{-} --> 2Fe{2+} E°= 0,77 V O: H2O2 --> O2 + 2H{+} +2e{-} E°= 0,68 V From here I tried to apply the formula K=10^\frac{nE°_{(fem)}}{0,0592} but I can't get the re...
by anto007
Sat Oct 23, 2021 1:26 pm
Forum: Chemistry forum
Topic: Determine the equilibrium constant
Replies: 10
Views: 4252

Determine the equilibrium constant

Hi everybody, would you help me to understand how to do this exercise:
"Determine the equilibrium constant for the following reaction at 298 K.
2Fe{3+}(aq) + H2O2(aq)--> 2H{+}(aq) + O2(g) + 2Fe{2+}(aq)."
by anto007
Sat Oct 23, 2021 1:21 pm
Forum: Chemistry forum
Topic: calculation of ionisation percentage
Replies: 4
Views: 2556

Re: calculation of ionisation percentage

thanks :)
by anto007
Sat Oct 23, 2021 7:14 am
Forum: Chemistry forum
Topic: calculation of ionisation percentage
Replies: 4
Views: 2556

Re: calculation of ionisation percentage

I did so:
pH= -log_10([H+])= 10^-4
%=((10^-4)/(0,6))*100=0,016

but I do not get the expected result (0.02%)
Should I round up?
by anto007
Sat Oct 23, 2021 2:44 am
Forum: Chemistry forum
Topic: calculation of ionisation percentage
Replies: 4
Views: 2556

calculation of ionisation percentage

Hi, could you help me with this exercise, please?
"The pH of a 0.6 M solution of a weak acid is 4.0. What is the percentage of ionised acid?"
Thanks.
by anto007
Thu Sep 30, 2021 9:17 am
Forum: Chemistry forum
Topic: Percentage by weight of a mixture
Replies: 2
Views: 1946

Re: Percentage by weight of a mixture

thanks, I've already solved it
by anto007
Thu Sep 30, 2021 2:53 am
Forum: Chemistry forum
Topic: Percentage by weight of a mixture
Replies: 2
Views: 1946

Percentage by weight of a mixture

Hi everyone, I have the following exercise: "A solution containing 1.15 g of a mixture of NaOH and KOH is neutralised with 48.4 mL of 0.500 N H2SO4 solution. Calculate the percentages by weight of NaOH and KOH in the original mixture." Would you help me to understand how to solve it? Thank...
by anto007
Thu Sep 09, 2021 3:54 am
Forum: Chemistry forum
Topic: please, help be with balance
Replies: 11
Views: 8512

Re: please, help be with balance

is this the reaction to be balanced?
Na2S2O3 + O3 = SO3 + Na2O2

balanced reaction:
3Na2S2O3 + 5O3 → 6SO3 + 3Na2O2

However, please wait for confirmation from someone more experienced than me. :lol:
by anto007
Wed Sep 08, 2021 5:39 am
Forum: Chemistry forum
Topic: chimica inorganica II
Replies: 10
Views: 7257

Re: chimica inorganica II

Non c'é di che. Purtroppo non sono in grado di aiutarti, altrimenti avrei risposto anch'io. :lol:
by anto007
Wed Sep 08, 2021 4:03 am
Forum: Chemistry forum
Topic: chimica inorganica II
Replies: 10
Views: 7257

Re: chimica inorganica II

La nuova discussione che hai aperto la visualizzo in inglese, forse hai impostato il traduttore automatico sul tuo browser. Per la risposta devi avere un pò di pazienza... appena il moderatore la legge ti risponde
by anto007
Wed Sep 08, 2021 3:37 am
Forum: Chemistry forum
Topic: chimica inorganica II
Replies: 10
Views: 7257

Re: chimica inorganica II

gaggy wrote: Wed Sep 08, 2021 3:32 amgrazie mille
di nulla :wink:
by anto007
Wed Sep 08, 2021 3:16 am
Forum: Chemistry forum
Topic: chimica inorganica II
Replies: 10
Views: 7257

Re: chimica inorganica II

Ciao, ti consiglio di scrivere in inglese, altrimenti difficilmente troverai risposta