June 19, 2019, 11:08:19 AM
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Topic: M O L E S  (Read 184 times)

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Offline kahynickel

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M O L E S
« on: May 28, 2019, 03:22:58 PM »
the Al2O3 in x grams of the mixture to dissolve. the reaction occurring is
Al2O3 +   2OH- + 3H2O ..2Al(OH)4-
800 cm3 of 2 M HCl(aq) is just sufficient to cause all the oxide in x grams of the mixture to dissolve.

AL2O3   +    6H+ ...2Al3+   +    3H2O
MgO      +    2H+ ...Mg2+    +  H2O
How many moles of each oxide is present in x grams of the mixture?
Moles of MgO = [Total moles of HCl] – [Moles of HCl used for Al2O3] /2 

did not get the right answer....??

Offline mjc123

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Re: M O L E S
« Reply #1 on: May 29, 2019, 04:23:58 AM »
You've missed out a bracket there, don't know if that is the full explanation...

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