if 130 g of KNO3 are added to 100 g of water at 40 degrees Celsius.How many grams do not dissolve?

30g

66

To determine the number of grams of potassium nitrate (KNO3) that do not dissolve in water, you need to know its solubility at the given temperature. Solubility refers to the maximum amount of solute that can dissolve in a given amount of solvent. In this case, you would need to identify the solubility of potassium nitrate at 40 degrees Celsius.

Once you have the solubility value, you can calculate the maximum amount of potassium nitrate that can dissolve in 100 g of water at 40 degrees Celsius. Subtracting this maximum amount from the actual amount of potassium nitrate (130 g) will give you the amount that does not dissolve.

Therefore, the answer to your question depends on the solubility of potassium nitrate at 40 degrees Celsius. Could you provide the solubility value?

Tbh

That depends upon the solubility of KNO3 at that temperature. I assume you have a graph or table in your text or notes that will give you that information.