27. Denny was playing on a swing as shown in the diagram below.
kinetic & potential
B.
No kinetic energy
no kinetic energy
Which one of the following statements is true when Denny swung from position A to
B and then to C?
(1) The potential energy at A, B and C are the same. X
(2) Potential energy was the highest at A and was lost at B. X
(3) Kinetic energy increased from A to B and again from B to C.
(4) Kinetic energy increased from A to B and decreased from B to C.

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%

it takes on an electronical energy

the right answer is c i just did the question.