Question

If there is 1 g KH2PO4 and 1 g K2HPO4 in 100mL of solution, what is the mEq/mL of potassium? The Answer is 0.19mEq/mL. But I need to show work on how to get the answer.

Textbook Applied physical pharmacy By Mansoor M. Amiji, Beverly J. Sandmann
Chapter 3