Question

Which is the correct mole ratio of k3po4 to kno3 in the chemical reaction mg(no3)2 + k3po4 ®mg3(po4)2 + kno3?

Answer 1

3Mg(NO3)2 + 2K3PO4 ---> Mg3(PO4)2 + 6KNO3

n(K3PO4):n(KNO3)=2:6=1:3
n(K3PO4):n(KNO3)=1:3

Answer 2

Answer:

1 : 3

Explanation:

First we right out the balanced chemical equation

$3Mg(NO_{3} )_{2} +2K_{3}PO_{4} --->  Mg_{3} (PO_{4} )_{2}+6KNO_{3}$

Then from there we use the stoichiometric coefficients to write the molar ratios:

$n(K_{3} PO_{4} ): n(KNO_{3} ) = 2:6=1:3$