Friday, November 20, 2009

Determine the number of moles of each type of monatomic or polyatomic ion in one mole of the following compoun

Determine the number of moles of each type of monatomic or polyatomic ion in one mole of the following compounds. For each polyatomic ion, determine the number of moles of each atom present in one mole of the ion.





WHAT I'M ASKING IS PICK ANY ONE OF THESE AND EXPLAIN THE STEPS YOU USED TO GET IT BECAUSE I DON'T KNOW HOW TO SOLVE THESE TYPES OF PROBLEMS.





a.) KNO3


b.) Na2SO4


c.) Ca(OH)2


d.) (NH4)2SO3


e.) Ca3(PO4)2


f.) Al2(CrO4)3





I WILL GRANT 10 POINTS TO THE PERSON WHO ANSWERS MY QUESTION!!!

Determine the number of moles of each type of monatomic or polyatomic ion in one mole of the following compoun
Chapter 7 Review


Pg. 236


# 31





(just look back at pg. 223--Practice problem #1)
Reply:Well let's say we have 1 mole of KNO_3.





Now to start you have to ask yourself, which parts of this compound are the cations (positive) and anions (negative).





Well I happen to know that K is the cation as it is placed first, and N0_3 is the anion, placed after.





Now we need to know how many of these cations and anions are in one single molecule of the compound. Well we check the subscripts to determine that:





KNO_3 can be written as:


(K)(NO_3)





So from here we can see that 1 moleclue of KNO_3 is made of 1 K cation and 1 NO_3 anion.





From this we can transfer everything over:





For 1 mole KNO_3 there are 1 mole of K cation and 1 mole of NO_3 anion.





So, basically figure out the cations and anions, figure out how many of each are in one molecule and transfer that to moles.

broadleaf

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