Calculate the solubility of KNO3 in moles per liter?

10g of KNO3 was added to 20.0 mL of water.It was boiled and cooled down, the precipitation temperature was 38 Celsius.
How to calculate solubility of KNO3 in moles per liter from the above information provided?
Any help will be appreciated..thanks.

Answer:
With the information provided, the best answer will be the solubility of KNO3 at 38oC.

?M(mol / L) = (10g KNO3 / 20.0mL)(1000mL / L)(1 mol KNO3 / 101.11g KNO3)
M(mol / L) = 4.95M at 38oC (maximum solubility at 38oC)

The solubility graph referenced below will allow you to determine the solubility of potassium nitrate KNO3 at various temperatures. The units are in g/100mL of water

For example, at 38oC, 4.95M = ~50g/100mL H2O
At 25oC, the solubility is 38g/100mL H2O = 3.76M
Using a solubility curve .

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