D Question 1
1 pt
1. What is the best definition of the term "theory," as it is used in science?
1 A theory is a guess or hunch about something that has occurred in nature.
2 A theory is a hypothesis that uses laws and observation to make an assumption.
3A theory is based on verifiable laws and can be proven true.
4 A theory is a comprehensive set of ideas explaining a phenomenon in nature.
hos

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%

i don,t know so just answer mine