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fgiga [73]
3 years ago
7

An atom that contains six protons six neutrons and six electrons has a mass of approximately

Chemistry
1 answer:
exis [7]3 years ago
3 0
Six protons, six electrons, and six neutrons. The atom you are looking for is Carbon. The mass number is 12.

Mass number = protons + neutrons 
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Answer:

Stronium

Explanation:

It is a metal (and shows classic physical proerties). It also belongs to the second family, meaning it has two valence electrons.

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An element's atomic number is 87. how many protons would an atom of this element have
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Calculate the pH of a solution prepared by mixing: (Show your work for these calculations) pk of acetic acid is 4.75 a. two mole
kupik [55]

Answer:

Explanation:

To calculate pH you need to use Henderson-Hasselbalch formula:

pH = pka + log₁₀ \frac{[A^-]}{[HA]}

Where HA is the acid concentration and A⁻ is the conjugate base concentration.

The equilibrium of acetic acid is:

CH₃COOH ⇄ CH₃COO⁻ + H⁺ pka: 4,75

Where <em>CH₃COOH </em>is the acid and <em>CH₃COO⁻ </em>is the conjugate base.

Thus, Henderson-Hasselbalch formula for acetic acid equilibrium is:

pH = 4,75 + log₁₀ \frac{[CH_{3}COO^-]}{[CH_{3}COOH]}

a) The pH is:

pH = 4,75 + log₁₀ \frac{[2 mol]}{[2 mol]}

<em>pH = 4,75</em>

<em></em>

b) The pH is:

pH = 4,75 + log₁₀ \frac{[2 mol]}{[1mol]}

<em>pH = 5,05</em>

<em></em>

I hope it helps!

7 0
3 years ago
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