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Morgarella [4.7K]
2 years ago
11

What is the mass number of silver

Chemistry
2 answers:
Lelu [443]2 years ago
6 0

Answer:

Atomic Number: 47

Atomic Mass: 107.8682 u

kakasveta [241]2 years ago
5 0

Silver (Atomic Mass) :- 107.8682 u

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Hydrofluoric acid, hf, has a ka of 6.8 × 10−4. what are [h3o+], [f−], and [oh−] in 0.710 m hf?
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Answer:

[H₃O⁺] = [F⁻] = 2.2 x 10⁻² M. & [OH⁻] = 4.55 x 10⁻¹³.

Explanation:

  • For a weak acid like HF, the dissociation of HF will be:

<em>HF + H₂O ⇄ H₃O⁺ + F⁻.</em>

[H₃O⁺] = [F⁻].

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Ka = 6.8 x 10⁻⁴, C = 0.710 M.

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<em></em>

∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.

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How many moles are in 25 g KMnO4
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25.0 grams KMnO4              1 mole

-----------------------------  x --------------------------  = 0.158 moles KMnO4

                                          158.04 grams

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