3. Atoms can be considered the basic building blocks
of matter
8
Atom X has 9 protons, 10 neutrons
and 9 electrons
Atom Y has 9 protons, 9 neutrons
and 9 electrons
Which of the following statements best describes
how Atom X and Atom Y are related?
A X and Y are isotopes of the same element,
B
X is an ion and Y is a neutral atom.
X and Y are different elements.
D. X is neon and Y is fluorine.

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%

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

2b2t

explanation:

2b2t

idk what the question is about