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Topic: Stoichiometry Question  (Read 5653 times)

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Offline nordqvist

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Stoichiometry Question
« on: September 28, 2011, 06:46:50 PM »
Hi there guys, I've tried balancing this equation but it seems to be too hard. Is my approach to the question the right one. How would you solve it?

A mass of 21.5 grams of calcium hydroxide reacts with an excess of phosphoric acid. What mass of calcium phosphate could be recovered from solution?

   a.    31.6 grams
   b.  326 grams
   c.   284 grams
   d.   186 grams
   e.  94.7 grams

Offline Arkcon

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Re: Stoichiometry Question
« Reply #1 on: September 28, 2011, 08:59:46 PM »
OK.  Let's start by writing the reactants and known products using chemical notation.  There are subscript buttons above for you to use.  Lets see if you can balance the equation
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline nordqvist

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Re: Stoichiometry Question
« Reply #2 on: September 28, 2011, 09:40:06 PM »
2H3PO4+3Ca(OH)2 -> Ca3(PO4)2 + 6H2O

Offline Hunter2

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Re: Stoichiometry Question
« Reply #3 on: September 29, 2011, 01:13:30 AM »
Now calculate how many mole is 21,5 g Calciumhydroxide.  How many mole of the phosphate correspond to it. Calculate back the mass of the Phosphate.

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