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3 years ago

Am I closing the right one? Somebody help!

Chemistry

2 answers:

son4ous [18]3 years ago

5 0

The correct answer is B.

kolbaska11 [484]3 years ago

4 0

Answer:

Yes you are choosing the right one because the sodium hydroxide with sulfuric acid is the correct answer

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How many atoms are in 45.22 moles of strontium

AleksandrR [38]

Answer:

272.31× 10²³ atom of strontium

Explanation:

Given data:

Number of moles of strontium = 45.22 mol

Number of atoms = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

45.22 mol × 6.022 × 10²³ atom / 1 mol

272.31× 10²³ atom

7 0

3 years ago

What occurs when cr3 ions are reduced to cr2 ions? electrons are lost and the oxidation number pf chronium increases?

vaieri [72.5K]

Answer : The electrons are gained and the oxidation number of chromium decreases.

Explanation :

As we know that a redox reaction is a reaction in which the oxidation and reduction takes place simultaneously.

Oxidation reaction : The reaction where a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : The reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

The balanced half reaction will be :

$Cr^{3+}+e^-\rightarrow Cr^{2+}$

In this reaction, the oxidation number of 'Cr' changes from (+3) to (+2) that means 'Cr' gains 1 electron and it shows reduction or the oxidation number decreases.

Hence, the electrons are gained and the oxidation number of chromium decreases.

7 0

3 years ago

5.6

lesantik [10]

200/19.32=10.352ms^-1

7 0

3 years ago

Read 2 more answers

How to knof if d orbital is paramagnetic?

Agata [3.3K]

<span>Write down the electron configuration.Draw the valence orbitals.Identify if unpaired electrons exist.<span>Determine whether the substance is paramagnetic or diamagnetic.</span></span>

5 0

3 years ago

How many co2 molecules are generated from each pyruvate molecule that enters the mitochondrial matrix?

Katena32 [7]

The co2 molecules that are generated from each pyruvate molecule that enters the mithochondria matrix, the number of co2 molecules is Three (3). It has a total of 3 co2 molecules that are generated from each pyruvate molecule that enter the mitochondria.

3 0

3 years ago