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xenn [34]
3 years ago
15

What is the third most common gas found in the air we breath?

Chemistry
2 answers:
jok3333 [9.3K]3 years ago
6 0

Explanation: The most common gas people breathe from clean air is nitrogen. Air is a mixture of gases, and the air on Earth contains about 78 percent nitrogen and about 21 percent oxygen. Argon, carbon dioxide neon, helium, methane, krypton, hydrogen and xenon are in much smaller amounts.

Setler [38]3 years ago
6 0

Answer: Carbon dioxide

Explanation:

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Why is the mass in amu of a carbon-12 atom reported as 12.011 in the periodic table of the elements?
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The mass of an element listed in the Periodic Table is the weighted average of all its naturally occurring isotopes.

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How many moles of H atoms are in 15.2 grams of pure ice?
nikitadnepr [17]

The number of moles of H atoms in 15.2 grams of pure ice is 0.850 moles

The number of moles of O atoms in 15.2 grams of pure ice is 13.50 moles

<h3>What is an atom?</h3>

An atom is a smallest indivisible particle of a chemical element that is capable of independent existence.

  • Pure ice contains the H2O molecules and the molar mass of H2O is 18.02 g/mol

Using the relation:

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The number of moles of H2O = 15.2 grams/18.02 g/mol

number of moles of H2O = 0.8435 moles

If the atomic mass of H and O are as follow:

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Then:

the number of H atoms in 15.2 grams of pure ice = mass of H atom × molar mass of H2O.

the number of H atoms = 0.8435 mol × 1.00784 g/mol

the number of H atoms = 0.850 moles

the number of O atoms in 15.2 grams of pure ice = 0.8435 mol × 15.999 g/mol

the number of O atoms = 13.50 moles

Learn more about atoms here:

brainly.com/question/25832904

6 0
3 years ago
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