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Aleks04 [339]
2 years ago
6

8.5 g of rubidium are reacted completely with water.

Chemistry
1 answer:
juin [17]2 years ago
5 0

Answer:

0.040M RbOH

Explanation:

The reaction of Rb with water is:

2Rb + 2H₂O → 2RbOH + H₂

As 2 moles of rubidium produce 2 moles of rubidium hydroxide, we need to find the moles of rubidium added. With these moles and the volume we can find molar concentration of RbOH as follows:

<em>Moles Rb = Moles RbOH -Molar mass Rb = 85.4678g)</em>

8.5g * (1mol / 85.4678g) = 0.099 moles RbOH

As 1dm³ = 1L, the volume in liters is 2.5L

That means molarity is:

0.099 moles RbOH / 2.5L =

<h3>0.040M RbOH</h3>

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Answer:

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5 0
2 years ago
Which identifies an oxidation-reduction reaction?
Strike441 [17]

Answer:

Explanation:

The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Consider the following reactions.

4KI + 2CuCl₂  →   2CuI  + I₂  + 4KCl

the oxidation state of copper is changed from +2 to +1 so copper get reduced.

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the oxidation state of carbon is +2 on reactant  side and on product side it becomes  +4 so carbon get oxidized.

Na₂CO₃ + H₃PO₄  →  Na₂HPO₄ + CO₂ + H₂O

The oxidation state of carbon on reactant side is +4. while on product side is  also +4 so it neither oxidized nor reduced.

H₂S + 2NaOH → Na₂S + 2H₂O

The oxidation sate of sulfur is -2 on reactant side and in product side it is also -2 so it neither oxidized nor reduced.

Oxidizing agents:

Oxidizing agents oxidize the other elements and itself gets reduced.

Reducing agents:

Reducing agents reduced the other element are it self gets oxidized

8 0
3 years ago
HELPPP!!
lord [1]

Answer:

The anion at the end on the compound

Explanation:

to check whether a substance is soluble or not, you would find the anion at the end of the compound on a solubility chart and then see from there whether it is soluble or not

5 0
3 years ago
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tangare [24]

A. True

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7 0
3 years ago
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IrinaK [193]
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