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3 years ago

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calculate the average atomic mass for neon if its abundance in nature is 90.5% neon-20, 0.3% neon-21, and 9.2% neon-22

1 answer:

Maru [420]3 years ago

4 0

The average atomic mass of Neon would simply be the sum of the weighted average of each isotope. That is:

average atomic mass = 0.905 * 20 + 0.003 * 21 + 0.092 * 22

average atomic mass = 20.187 amu

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C – 19,9%, H – 2,2%, N – 11,6%, O – x%

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1 percentage

The entire molecule is 100% and all the components of the compound add up to 100%.

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The compound contains 66,1% oxygen.

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<u>hydrogen</u>

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4 amount of substance

<u>carbon</u>

<u /> $n=\frac{23,76g}{12,01\frac{g}{mol} }\\n=1,98mol$ <u />

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<u>hydrogen</u>

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The compound contains about 3 moles of hydrogen.

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The compound contains about 5 moles of oxygen.

<u>nitrogen</u>

<u /> $n=\frac{13,92g}{14,007\frac{g}{mol} }\\n=0,99mol$ <u />

The compound contains about 1 moles of nitrogen.

5. molecular formula

The formula results from the ratio of the amounts of substance.

$n_{C} :n_{H} :n_{O} :n_{N} =2:3:5:1\\C_{2}H_{3}NO_{5}$

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