...when 0.75 mol of K3PO4 dissolves completely in water?
And explain please.
And explain please.
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0.75 * (4 ions), because there's 3 K+ ions, and 1 PO4- ion. Thus, a simple calculation will tell you 3.00 MOLES of IONS were released, but only 0.75 mol of the TOTAL substance was released.
If it asked you how many moles of K+ ions were released, you would take 0.75(3), and get 2.25 mol of K+ ions.
If it asked you how many moles of PO4- ions were released, you would take 0.75(1) and get 0.75 mol of PO4- ions.
However, it asked you the total moles of ions, so we just added the number of ions together (3+1) and multiplied it by the moles of the substance.
If it asked you how many moles of K+ ions were released, you would take 0.75(3), and get 2.25 mol of K+ ions.
If it asked you how many moles of PO4- ions were released, you would take 0.75(1) and get 0.75 mol of PO4- ions.
However, it asked you the total moles of ions, so we just added the number of ions together (3+1) and multiplied it by the moles of the substance.