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Furkat [3]
3 years ago
13

What is the percent of Cr in Cr2O3

Chemistry
2 answers:
IgorLugansk [536]3 years ago
5 0
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 %.
lys-0071 [83]3 years ago
4 0

Answer:

68.41

Explanation:

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Parantheses mean present of a subgroup or a group of polyatomic ions in a chemical reaction.

<u>Explanation:</u>

In a chemical reaction, sometimes, a compound may be composed of group of polyatomic ions with other ions. Some of the polyatomic ions are sulfate, carbonate, nitrate, hydroxide, bicarbonate, ammonia etc.

So these polyatomic ions are formed by combining two or more elements. Thus, if the number of polyatomic ions in a compound is more than one, then we use parathesis and write those polyatomic ions in it and write the number of polyatomic ions present in the compound as subscript of the parathesis.

For example, Fe₂(SO₄)₃

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3 years ago
As a chemical reaction occurs, the thermometer in the container records a decrease in temperature. What is true of the reaction?
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yawa3891 [41]

Answer: The chemical formula for the formula given in the image is C_4H_9O_2.

Explanation: There are many ways in which a model can be represented:

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Explanation:

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mr Goodwill [35]

Answer:

Here's what I get  

Explanation:

There are two methods of naming esters.

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5. isopropyl alcohol + formic acid ⟶ isopropyl formate

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