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3 years ago

8

What is a small ball that orbits around a planet. There's no science section sorry

1 answer:

miskamm [114]3 years ago

7 0

Answer:

Moon I am guessing. Another option is comet, but they normally don't orbit a planet.

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Boron has two naturally-ocurring isotopes. Boron-10 has an abundance of 19.8% and actual mass of 10.013 amu, and boron-11 has an

aniked [119]

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Average atomic mass = 10.812 amu

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

<u>For first isotope, Boron-10: </u>

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<u>For second isotope, Boron-11: </u>

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Mass = 11.009 amu

Thus,

$Average\ atomic\ mass=\frac{19.8}{100}\times {10.013}+\frac{80.2}{100}\times {11.009}=1.982574+8.829218=10.811792$

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BlackZzzverrR [31]

Answer: 3 & 4

Explanation:

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