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grigory [225]
3 years ago
5

Determine the number of valence electrons for the following: [kr] 5s2 4d6

Chemistry
1 answer:
wlad13 [49]3 years ago
3 0

Answer: B) 2 (as indicated by electron distribution shown), but taking into account the real properties of this element, 4,7,8 also occur (see below).

Explanation:

This is the electron complement/atomic number of ruthenium, which actually has the structure [Kr] 5s1 4d7

Nevertheless, Ru does not form Ru(I) compounds and few Ru(II) compounds (RuCl2, RuBr2, RuI2). It also forms Ru(III)Cl3 and a larger number of Ru(IV) compounds, e.g. RuO2, RuS2. It also forms RuO4

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Answer:

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Explanation:

The acidity of a solution is measured by its pH, which is the logarithm of the inverse of the molar concentration of hydronium (H₃O⁺) ions:

  • pH = log 1 / [H₃O⁺] = - log [H₃O⁺]

When you know the pH value you can find hydronium concentration using the antilogaritm function:

pH=-log[H_3O^{+}]\\ \\ {[H_3O^+]}=10^{-pH}\\ \\ {[H_3O^+]}=10^{-2.50}\\ \\ {[H_3O^+]}=0.0032

The unit of molar concentration is M.

To prove your answer you can take the logarithm of 0.0316:

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irakobra [83]

Answer:

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8 0
2 years ago
How much pressure would 0.8 moles of a gas at 370K exert if it occupied 17.3L of space
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Answer:

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