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Mass Number and Representation of Atom

Neon occurs a...

Question

Neon occurs as two isotopes of mass numbers 20 and 22. Its relative atomic mass is 20.2. What is the percentage of ²⁰Ne in naturally occurring neon?

A

90

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B

80

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C

20

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D

10

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Solution

The correct option is A
90

Solution

We can use the formula:

Average atomic mass of Ne = [(Atomic mass of X₁) x (% of X₁)] + [(Atomic mass of X₂) x (% of X₂)]

100 100

20.2 = (20 x X ) + [22 x (100 - X)]

100 100

2020 = 20X + 2200 - 22X

2X = 180

X = 90%

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Neon occurs as two isotopes of mass numbers 20 and 22. Its relative atomic mass is 20.2. What is the percentage of ²⁰Ne in naturally occurring neon?

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