Describe why the mouse survived when the mint plant is present even though no new oxygen (O2) could have entered the jar. Make sure to use the C (Claim, answer to question) E (Evidence, stuff that supports your claim) R (Reasoning, how you know your evidence supports your claim)

Priestly found that when mint (a plant) was allowed to grow in a closed container of air, it produced oxygen, which allowed a flame to burn and a mouse to survive. This is as opposed to the carbon dioxide that builds up from an animal in a trapped space.

Explanation:

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%