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Lilit [14]
3 years ago
13

What is the mass of oxygen in 3.34 g of potassium permanganate?

Chemistry
1 answer:
3241004551 [841]3 years ago
5 0

Answer:

1.35 g

Explanation:

Data Given:

mass of Potassium Permagnate (KMnO₄) = 3.34 g

Mass of Oxygen: ?

Solution:

First find the percentage composition of Oxygen in Potassium Permagnate (KMnO₄)

So,

Molar Mass of KMnO₄ = 39 + 55 + 4(16)

Molar Mass of KMnO₄ = 158 g/mol

Calculate the mole percent composition of  Oxygen in Potassium Permagnate (KMnO₄).

Mass contributed by Oxygen (O) = 4 (16) = 64 g

Since the percentage of compound is 100

So,

                        Percent of Oxygen (O) = 64 / 158 x 100

                        Percent of Oxygen (O) = 40.5 %

It means that for ever gram of Potassium Permagnate (KMnO₄) there is 0.405 g of Oxygen (O) is present.

So,

for the 3.34 grams of Potassium Permagnate (KMnO₄) the mass of Oxygen will be

                  mass of Oxygen (O) = 0.405 x 3.34 g

                  mass of Oxygen (O) = 1.35 g

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Answer:

15.2mL of the 0.10M sodium formate solution and 4.8mL of the 0.10M formic acid solution.

Explanation:

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As both solutions are 0.10M and you want to create 20mL of the buffer, the moles are:

0.10M  * 20x10⁻³L =

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Replacing (2) in (1):

3.162 = 2x10⁻³moles - [HA] / [HA]

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<h3>15.2mL of the 0.10M sodium formate solution</h3>

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3 years ago
What is a possible benefit of having the Food and Drug Administration (FDA) test a new drug instead of having the drug manufactu
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The FDA would have better authority i guess than the manufacturer and it would be safer for the FDA to test it out. Hope it helps
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Answer:

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Explanation:

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3 years ago
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Answer:

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Hello,

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