Given :
0.26 mole of [tex]K_3PO_4[/tex] and 0.35 L of water.
To Find :
The molarity of a solution of [tex]K_3PO_4[/tex] made by mixing 0.26 mole of potassium
phosphate with water up to 0.35 L .
Solution :
We know, molarity is given by :
[tex]M = \dfrac{number \ of \ moles }{Volume \ in \ Liter}\\\\M = \dfrac{0.26}{0.35}\ M\\\\M = 0.743 \ M[/tex]
Therefore, the molarity of [tex]K_3PO_4[/tex] solution is 0.743 M.