Qvault

[iphone2020]

Guys is this error or am I missing something?

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[DMikes]

Seems to be an error to me unless I'm also missing something.

 

[iphone2020]

I think so too! I have found couple errror on Qvault!


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[Kombucha]

The correct answer is A because CaCl2 has a much higher molar weight than NaCl. 10 g of each sample would get you (10/58)(2) = 0.34 mol of Na+ and Cl- vs (10/111)(3) = 0.27 mol of Ca2+ and Cl-.

 

[iphone2020]

Yeah but according to destroyer or even Chad the lowest freezing point has to do with highest dissociation so that's reason why it comes out little confusing! But i understand your point as well


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[Kombucha]

Yeah but according to destroyer or even Chad the lowest freezing point has to do with highest dissociation so that's reason why it comes out little confusing! But i understand your point as well


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This would make answer B even more incorrect since Ca(OH)2 is less soluble than NaOH.

 

[Henry Killinger]

No it's correct. It says 10 grams

10/58(molar mass NaCl) * 2 = 0.345
10/110(molar mass CaCl2) * 3 = 0.27

Therefore NaCl will have more influence and decrease the freezing point the most.

EDIT: UGH I just noticed Kombucha said the same thing XD

 

[DMikes]

it says "grams" not "moles"

 

[iphone2020]

So we must do the calculation in order to get end result! I was just going base on the i number and assuming that got it


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