[CNR-engineering]

Hi, Everyone I was just working through some chemistry problems for practice, but I am stuck on two of them.  I just need help getting me started in the right direction. Any help is greatly appreciated as well.

 1. MgNH4PO4  6H20 has a solubility of 0.023g/100ml in water. Suppose a 5.02g sample were washed with 20ml of water. What fraction of the MgNH4PO4  6H20 would dissolve?

   Would I just take a 5th .023g and that would be my anwser?  Im assuming this means that .023g/100ml will disolve in water no how many grams of MgNH4PO4 6h20 you add to it?

 2. MgNH4PO4  6H2O loses H20 stepwise as it is heated.  Between 40c and 60c the monohydrate is formed and above 100c the anhydrous material is formed.  What are the phosphorus percentages of the monohydrate and of the anhydrous material?

I dont even know how to attempt number 2, I hate to be so vague ,but its just not clicking. I would appreciate any help I am not looking to be spoon fed.

[Yggdrasil]

1. MgNH4PO4  6H20 has a solubility of 0.023g/100ml in water. Suppose a 5.02g sample were washed with 20ml of water. What fraction of the MgNH4PO4  6H20 would dissolve?

   Would I just take a 5th .023g and that would be my anwser?  Im assuming this means that .023g/100ml will disolve in water no how many grams of MgNH4PO4 6h20 you add to it?

Correct.

2. MgNH4PO4  6H2O loses H20 stepwise as it is heated.  Between 40c and 60c the monohydrate is formed and above 100c the anhydrous material is formed.  What are the phosphorus percentages of the monohydrate and of the anhydrous material?

I dont even know how to attempt number 2, I hate to be so vague ,but its just not clicking. I would appreciate any help I am not looking to be spoon fed.

The question is asking what percentage of the mass of the monohydrated salt (MgNH₄PO₄ H₂O) or the anhydrous salt (MgNH₄PO₄) comes from the phosphorus atom.