Which of the following statements correctly describes the relationship between fossils and rock strata? Fossils found in the rock strata are all the very small in size.
Fossils are all found only in the top layers of the rock strata.
Fossils found in the rock strata range in size from the very tiny to very large.
Fossils are all found only in the bottom layers of the rock strata.

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 increase of protons   hope this

um i think it might be a car?

c. 4.54 x 10–12 j happens to be correct