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itzyoboyCj
04.01.2020 •
Chemistry
How many oxygen atoms are in 2.30 g of quartz?
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Ответ:
4.61 * 10²² oxygen atoms
Explanation:
Quartz is the common name of a silicon mineral, SiO₂. To solve the problem, we need to calculate the molar mass (MM) of quartz:MM = AtomicMass of Si + 2 * AtomicMass of O
MM = 28.08 + 2 * 16
MM = 60.08 g/mol
Then we can calculate how many moles of quartz are in 2.30 g:2.30 g *
= 0.0383 mol
Then we use Avogadro's number calculate the number of oxygen atoms in 0.0383 mol of SiO₂, keeping in mind the number of O per quartz molecule:0.0383 mol SiO₂ *
= 4.61 * 10²² atoms of O
Ответ:
Alkaline Earth Metals are the 2nd Group of Metals on the Periodic Table.
Explanation:
Characteristics:
- Shiny
- Reactive
- Low melting and boiling points
- Low density
- 2 valence electrons
Alkaline Earth Metals cannot be found alone in nature since they are highly reactable (If you've ever thrown barium into a lake, it would cause a massive explosion).