How many grams of potassium phosphate would be needed to make 25.0ml of a 0.75m solution?

Answer : The mass of potassium phosphate needed will be 3.98 grams.

Explanation : Given,

Molarity of potassium phosphate = 0.75 M = 0.75 mole/L

Molar mass of potassium phosphate = 212.27 g/mole

Volume of solution = 25.0 mL = 0.025 L    (conversion used : 1 L = 1000 mL)

Molarity : It is defined as the number of moles of solute present in one liter of solution.

In this problem solute is, potassium phosphate.

Formula used :

Now put all the given values in this formula, we get:

Therefore, the mass of potassium phosphate needed will be 3.98 grams.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

the answer is true. hope it .