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Ray Of Light [21]
2 years ago
9

Please help me with these two

Chemistry
1 answer:
Anna [14]2 years ago
3 0
They exist in the outer orbitals
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What is the percent of Cr in Cr2O3
IgorLugansk [536]
The percentage of Chromium in Chromium Oxide is calculated as follow,

Step 1:
           Calculate Molar mass of Cr₂O₃,
Cr = 51.99 u
O = 16 u
So,
     2(51.99) + 3(16) = 103.98 + 48 = 151.98 u

Step 2:
          Secondly divide molar mass of only chromium with total mass of Cr₂O₃ and multiply with 100.
i.e.
                   = \frac{103.98}{151.98} × 100
                   
                   = 68.41 %
So, the %age composition of chromium in chromium oxide is 68.41 %.
5 0
3 years ago
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3 years ago
True or false: Atoms and mass are conserved in nature<br> True<br> False
katovenus [111]

Answer:

It’s true

Explanation:

If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system. ... The Law of Conservation of Mass holds true because naturally occurring elements are very stable at the conditions found on the surface of the Earth.

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2 years ago
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Answer:

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Explanation:

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3 years ago
True or false The atomic number of an element is always more than the mass number of that element.
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The sentence is true
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