Posted by Jaden on Tuesday, January 22, 2013 at 8:32pm.
See you post above.
The balanced reaction is
2 Rb3PO4 + 3 Ca(NO3)2
-> Ca3(PO4)2 + 6 RbNO3
Calculate the number of moles of each reactant.
The molar mass of Rb3PO4 is 351.41 g/mol
The molar mass of Ca(NO3)2 is 164.10 g/mol
You are reacting 0.07583 moles of the Ca salt with 0.04577 moles of the Rb salt.
One of the reactants (rubidium phosphate) appears to be limiting.
Take it from there.
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