Balance Reaction

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Jennifer Kainth 3L
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Joined: Fri Sep 24, 2021 6:11 am

Balance Reaction

Postby Jennifer Kainth 3L » Fri Oct 15, 2021 10:46 am

"Consider the following imbalanced reaction: PCl3+ H2O —->HCl + H3PO3. What quantity of HCl is generated when 23.6g of PCl3 reacts?" 
I think it would be a 1:3 ratio, however, I am unsure. 

Anna Dai-Liu 3B
Posts: 102
Joined: Fri Sep 24, 2021 5:24 am

Re: Balance Reaction

Postby Anna Dai-Liu 3B » Fri Oct 15, 2021 10:54 am

Since the balanced equation is PCl3 + 3H2O -> 3HCl + H3PO3, I think your ratio is correct!

Lauren Brotman 2F
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Joined: Fri Sep 24, 2021 7:33 am

Re: Balance Reaction

Postby Lauren Brotman 2F » Fri Oct 15, 2021 10:55 am

Yes, the balanced equation would be PCl3+ 3H2O —->3HCl + H3PO3 creating a 1:3 ratio for PCl3:HCl in moles. You can't use this ratio, however, until you convert the grams given into moles.

Ayla3H
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Joined: Fri Sep 24, 2021 7:09 am

Re: Balance Reaction

Postby Ayla3H » Fri Oct 15, 2021 10:57 am

Hi!
For this question we first have to balance the reaction, leaving us with the following balanced reaction:
PCl3 + 3H2O --> 3HCl + H3PO3.

Then, we have to convert 23.6g of PCl3 to moles by dividing 23.6 by the molar mass of the molecule (137.33 g/mol). Then, using the molar ratio we see from the equation (1 PCl3: 3 HCl) we can find out the amount, in moles, of HCl that will be produced. Finally, we can convert the number of moles of HCl into grams by multiplying it with the molar mass of HCl (36.46 g/mol). Hope this helps!

Neha Mukund
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Joined: Fri Sep 24, 2021 5:23 am

Re: Balance Reaction

Postby Neha Mukund » Sun Oct 17, 2021 7:46 pm

The ratio would be 1:3 for PCl3: 3 HCl. To find the amount of moles of a reactant, you would divide the given grams by the molar mass. Hope this helped!

Madison Kiggins 1E
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Joined: Fri Sep 24, 2021 5:41 am

Re: Balance Reaction

Postby Madison Kiggins 1E » Sun Oct 17, 2021 7:55 pm

Yes, for the balanced equation PCl3+ 3H2O —->3HCl + H3PO3, the ratio would be 1:3 for PCl3: 3 HCI. To find the answer, remember to convert the given grams of 23.6 g of PCl3 into moles by dividing it by the molar mass, then use the ratio of 1:3 to find the amount of HCI through the reaction. If it asks for the answer in grams, multiply the number of HCI moles produced by the molar mass to find the number in grams.

tristenleem3B
Posts: 100
Joined: Fri Sep 24, 2021 6:47 am

Re: Balance Reaction

Postby tristenleem3B » Sun Oct 17, 2021 8:00 pm

Yes, first we balance the equation and get PCl3 + 3H2O --> 3HCl + H3PO3, meaning that you're correct. Next, just convert the 23.6 g of PCl3 into moles, dividing my the molar mass and use the 1:3 ratio to find the amount of HCI.

Monse Mata 3D
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Joined: Fri Sep 24, 2021 7:36 am

Re: Balance Reaction

Postby Monse Mata 3D » Fri Oct 22, 2021 4:57 pm

The ratio you obtained seems right :) You should also remember to convert the given grams of 23.6 g of PCl3 into moles by dividing it by the molar mass, then use the ratio you got (1:3) to find the amount of HCI that was generated by the reaction.

Parinita Jithendra 2A
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Joined: Fri Sep 24, 2021 6:57 am

Re: Balance Reaction

Postby Parinita Jithendra 2A » Mon Oct 25, 2021 2:43 am

The ratio you have is correct! The only way to make sure would be to balance the equation and see the number of moles of each molecule and it seems like that is what you did here!

Rebecca Preusch 2C
Posts: 101
Joined: Fri Sep 24, 2021 6:26 am

Re: Balance Reaction

Postby Rebecca Preusch 2C » Thu Nov 04, 2021 11:20 pm

yes your ratio is correct


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