Thank you for the opportunity to help you with your question!

can u please provide the graph?

Please let me know if you need any clarification for the doubts. I'm always happy to answer your questions. Looking forward to help you again. thank you. :)

Oct 4th, 2015

The Solubility of copper sulphate is : 390 g/L

So For 100 g of water, volume = 100 ml ( assuming density = 1 gm/ml)

so the amount of copper sulphate required is 390 / 10 =39 grams.

from the graph we can see that 160 g of copper sulphate dissolves in 100 g of water, so for 4 g of copper sulphate at 100degree celcius we need 100/ 160 * 4 = 2. 5 grams

so we need 2. 5 grams of water at 100°C.

Oct 4th, 2015

hidden

so how could i figure out
The number of grams of water required to
dissolve 18 g KNO3 at 100°C.