Respuesta :
Assume a 100. g representative sample of ordinary matter on Earth. For each element, use the mass percentage to find the number of grams and the atomic mass to find the number of moles, beginning with oxygen.
100. g x (28.7% / 100.%) x (1.00 mol O / 15.999 g O) = 1.79 mol O
Now Aluminum:
100. g x (15.4% / 100.%) x (1.00 mol Al / 26.982 g Al) = 0.059 mol Al
Finally, divide the numbers of moles to find the mole ratio, which is equal to the ratio of atoms.
(1.79 mol / 0.059 mol) = 30.34
The answer should be rounded to two significant figures, so O atoms are about 30. times more common than Al atoms.
What three types of atoms are there?
Protons, electrons, and neutrons are the three basic types of particles that make up an atom.Protons and neutrons roughly share the same mass, however the mass of the electron is quite small.
How do atoms come into being?
Atoms are made up of a nucleus in the middle that is surrounded by protons, neutrons, and electrons.Uranium is split into smaller atoms during the fission process, creating new atoms.The creation of atoms in enormous numbers can be seen in the Big Bang & Supernova phenomena.
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