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dybincka [34]
3 years ago
14

Olivia became interested in the fossil evidence that Wegener used to form his hypothesis of continental drift. How did fossils s

how that the continents were once joined together?
A. Animal fossils such as the mesosaurus were found on one continent.
B. Scientists found examples of different kinds of fossils on some continents.
C. Plant fossils of the same kind of fernlike plants were found on five continents.
D. Freshwater animal fossils were found in the nearby oceans.
Chemistry
1 answer:
tangare [24]3 years ago
8 0

Answer:

C.Plant fossils of the same kind of fernlike plants were found on five continents

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You are given a solution that is 518 mM lactose. You need to make up 4.5 L of 16.7 mM solution. What volume do you need to trans
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Answer:

The volume you need to transfer from the stock solution is 0.145 l

Explanation:

Since the number of moles of lactose in the volume of stock solution that you transfer will be the same as the number of moles of lactose in the final solution, you can use this expression:

number of moles in volume to transfer = number of moles in the final solution

Since number of moles = concentration * volume (if the concentration is expressed in molarity), then:

Ci * Vi = Cf * Vf

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Ci = concentration of the stock solution.

Vi = volume of the stock solution to be transferred.

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Then, replacing with the data:

518 mM * Vi = 16.7 mM * 4.5 l

Vi = 16.7 mM * 4.5 l / 518 mM

<u>Vi = 0.145 l or 145 ml</u>

Notice that any concentration unit can be used, as long as the units of the concentration of the stock and final solution are the same.

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The overview of the subject is outlined underneath in the summary tab.

Explanation:

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