The crust and uppermost mantle make up the rigid outer layer of Earth, which is called the _____.

Chemistry

2 answers:

Andru [333]3 years ago

6 0

Here is your answer:

The crust and uppermost mantle make up the rigid outer layer of Earth, which is called the "lithosphere." The crust and the mantle makes up the lithosphere. The lithosphere is rigid outer part of the earth which contains the upper mantle and the crust.

Hope this helps!

~Nonportrit

AfilCa [17]3 years ago

5 0

Hey There,

@Mrmcleantheteacher

The crust and uppermost mantle make up the rigid outer layer of Earth, which is called the Lithosphere.

Let me know if you have any further questions!

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Answer:

35.8 u

Explanation:

The atomic mass of Cl is the weighted average of the atomic masses of its isotopes.

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its percent abundance).

Atomic mass of Cl-35 = 17p + 18n = 17 × 1.007 u + 18 × 1.009 u

= 17.119 u + 18.162 u = 35.28 u

Atomic mass of Cl-37 = 17p + 20n = 17 × 1.007 u + 20 × 1.009 u

= 17.119 u + 20.180 u = 37.30 u

Set up a table for easy calculation.

0.755 × 35.28 u = 26.64 u

0.245 × 37.30 u = 9.138 u

TOTAL = 35.8 u

Note: The actual atomic mass of Cl is 35.45 u.

The calculated value above is incorrect because

(a) the given isotopic percentages are incorrect and

(b) the protons and neutrons have less mass when they are in the nucleus than when they are free. Thus, the calculated masses of Cl-35 and Cl-37 are too high.

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