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Fed [463]
3 years ago
10

How did Mendeleev arrange the known elements?

Chemistry
2 answers:
Agata [3.3K]3 years ago
4 0
In order of relative atomic mass.
klemol [59]3 years ago
4 0
Mendeleev arranged elements in rows in increasing order according to their atomic number, while also grouping elements with similar chemical properties in columns.
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Answer:

455 Kcal

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2Cl2(g) + 7O2(g) + 130kcal → 2Cl2O7(g)

Rearranging we get,

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So for per mol reaction will be as above.

In case of 7 mols of product, we need 7/2 mole ratio x 130 = 455 Kcal

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