topscore Test 3 #54 Gchem

[tRNA]

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sorry that was #52 not 54

how do you know how to draw the structure of phosphorus oxychloride to find the sum of the formal charges, how do you know how many oxygens and chlorines to put??

 

[doc3232]

sorry that was #52 not 54

how do you know how to draw the structure of phosphorus oxychloride to find the sum of the formal charges, how do you know how many oxygens and chlorines to put??

Hmmmm...
Well I think it would have to say di and tri and etc if there are more than 1
I will go with POCl.
I don't know if I am right, but this works
Cl--P==O
Cl have 6 unpaired electrons on it
P has 2 unpaired electrons on it.
and the O has 4 unpaired electrons on it
So the 3 bonds have a total of 6 electrons, ADD up all these numbers you get 18 which is the number of valence electrons of all three atoms combined.

Someone correct me if I am wrong please.
Hope this helps

 

[WOAHHI]

Does the DAT require us to know the formulas of these compounds? It turns out phosphorous oxychloride has 3 Cl's but I did it your way assuming POCl and got the right answer - assuming it's luck. Will the real test have to say like Phosphorous trichloro etc.

 

[Philippines03j]

Wondering the same thing... I can go ahead and memorize a bunch of compounds unless it is not needed. Some of the ones I have come across in destroyer are Magnesium Phosphate(Mg3(Po4)2), Ammonium Phosphate (NH4)3PO4, ect... When I came across these I had no idea how many mg or po4 was in each. Is there a list of these I should have memorized?