Hester is arranging her vase collection on a bookshelf. She wants to minimize the total gravitational potential energy of the vases and shelf unit. Assuming she can only put one item on a shelf and the shelves are equidistant apart , what would be the best method of arranging the items?

Select one

1. Put the items in ascending order of weight going from the top shelf to the bottom

2. Put the heaviest items on the middle shelves and the lighter items on top and bottom

3. Put me lightest on te middle shelves and heavier items on top and bottom

4. Put the items in descending order weight going from the top shelf to bottom

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%

the food using pesticides in the future will harm you by giving you diseases like cancer or something since they have things that we should not eat in it like chemicals or pesticides. that is why organic food is more expensive because they take the time to make it right and healthy for you to eat.

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