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Ghella [55]
2 years ago
14

A chemist determined by measurements that 0.070 moles of barium participated in a chemical reaction. Calculate the mass of bariu

m that participated in the chemical reaction.
Be sure your answer has the correct number of significant digits.
Chemistry
1 answer:
34kurt2 years ago
5 0
Answer: 9.59g
remember: mass = moles x Mr
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What is the source of energy that is released in an exothermic reaction? what absorbs the energy that is released ?
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Hello,

Here are your answers:

The proper answers to your questions are....

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If you need anymore help feel free to ask me!

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3 years ago
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8 0
2 years ago
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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