Francesco redi disproved the idea of spontaneous generation through an experiment involving
mud and frogs.
water and plants.
meat and flies.

The correct answer is:

maggots (fly larvae) and meat.

Explanation:

In 1668, Francesco Redi, an Italian scientist, designed a scientific experiment to test the spontaneous creation of maggots by installing additional meat in each of two different jars. One jar was left open; the other was wrapped with a cloth. Days later, the open jar received maggots, whereas the closed jar contained no maggots. He did note that maggots were found on the exterior surface of the cloth that covered the jar. Redi, fortunately, demonstrated that the maggots came from fly eggs and thereby accommodated to disprove spontaneous generation.

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%