(90 pts) pls where are fossils from the “cambrian explosion” found in the grand canyon? what type of environment did the organisms live in and how do we know? describe what these creatures may have looked like. explain in 2-4 sentences .

cambrian explosion happened about 550million years ago. grand canyon was formed by the Colorado river about 20million years ago so the fossils from the CE would be in the bottom half of the canyon.

the organisms lived in a marine environment for them to be trapped in sedimentary rocks n formed fossils. they would be multi-cell organisms and many of them no longer exist today.

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%

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