Can someone plz help me plz giving brainliest

yes because it talks about what he pacifically he did and what the results was and he would probably need 2 get a little more data

Explanation:

I believe that the 1st scientist results were valid. If he did the experiment ithout flaws, then his data should be 100%  reliable. Now, the 2ed scientist should go back and redo the experiment incase she had a flaw, or recorded something wrong.

Explanation:

I hope this helps

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%