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ludmilkaskok [199]
4 years ago
14

The planet Gallifrey has two naturally occurring isotopes of chlorine. Chlorine-35 has an isotopic abundance of 45.89% and a mas

s of 34.9689 amu. Chlorine-37 has an isotopic abundance of 54.11% and a mass of 36.9659 amu.
Calculate the average atomic mass of chlorine on planet Gallifrey.
Chemistry
1 answer:
Furkat [3]4 years ago
6 0

Answer:

36.05 amu

Explanation:

Given data

Isotope       Mass (m)               Abundance (ab)

³⁵Cl              34.9689 amu        45.89% (0.4589)

³⁷Cl              36.9659 amu        54.11% (0.5411)

We can calculate the average atomic mass (am) of chlorine on planet Gallifrey using the following expression.

am = ∑ mi × abi

am = 34.9689 amu × 0.4589 + 36.9659 amu × 0.5411

am = 36.05 amu

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PRACTICE
Stels [109]

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

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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

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             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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ionic  equation   is  as  follows
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