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2 years ago

What is the mass of 0.38 moles of cobalt (Co)?

Chemistry

1 answer:

marta [7]2 years ago

4 0

Answer:

The required mass is 22.04 g

Explanation:

We know,

Atomic mass of Co= 58g.

Now,

1 mole Co = 58 g

∴ 0.38 mole Co= (58 X 0.38) g

= 22.04 g

So, the required mass is 22.04 g

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Classify the following substituents according to whether they are electron donors or electron acceptors relative to hydrogen by

igor_vitrenko [27]

Species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.

<h3>What is resonance?</h3>

The term resonace has to do with the movement of electron pairs in a molecule. Inductive effects has to do with the drawing of electron density towards an atom or bond.

The two effects depends on the nature of a substituent. For instance, species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.

The question is incomplete hence the exact nature of the substituents can not be determined.

Learn more about resonance: brainly.com/question/23287285?

8 0

2 years ago

Read 2 more answers

Write the atomic symbol for the isotope of bismuth with 125 neutrons.

vlada-n [284]

First, isotopes are the atoms of a single element whose nuclei have a different number of neutrons, and therefore, differ in mass numbers. You should know that atoms are formed by a nucleus that has a small size and is made up of protons and neutrons. The nucleus is surrounded by a cloud of electrons, which are found in a region of the atom called the cortex.

The mass number, represented as A, is the sum of the number of protons and neutrons in the nucleus. On the other hand, the atomic number (Z) is the number of protons that exist in the nucleus.

The isotopes of an element X are represented as follows,

(see first attached picture)

It should be noted that the number of neutrons of a chemical element can be calculated as the difference A-Z.

The atomic and mass numbers of bismuth with 125 neutrons are:

Z = 83

A = 83 + 125 = 208

Thus, the atomic symbol of the bismuth isotope with 125 neutrons is:

(see second attached picture)

5 0

2 years ago

Which describes the relationship between [H+] and [OH−] ?

jarptica [38.1K]

For a neutral solution,
[H+][OH-] = 1 x 10⁻¹⁴

7 0

3 years ago

When phosphorus reacts with chlorine, phosphorus trichloride is formed according to the following equation: ___P4(s) ___Cl2(g) →

Slav-nsk [51]

Answer:

P4 + 6Cl2 ------> 4PCl3

145.59 g of Cl.

Explanation:

First to all, let's balance the equation. The principle for balance an equation, try to see this like a balance of two plates. You need to have the same numbers of atoms of both sides of the plates to equilibrate the balance.

In this case, we have 4 atoms of P, 2 of Cl on one side, and for the other side we have 1 atom of P and 3 of chlorine.

To balance this, we balance first the P on the right side putting a leading 4, and we have 4PCl3.

Now this 4, is also added to the Cl, and it's multiplied, so we have 12 Cl in total on the right side. To balance this, we put a leading 6 on the left side in the Cl.

The final balanced equation would be

P4 + 6Cl2 ------> 4PCl3

Now that we have the balanced equation, let's calculate the grams of Cl needed:

In this case, first, let's calculate the mole of P used in the 21.2 g. We need the atomic weight of P, which is 30.97 g/mol and the Cl is 35.45 g/mol

moles of P = g/AW = 21.2 / 30.97 = 0.6845 moles

With the balanced equation, we can do a relation between P and Cl.

If 1 mole P reacts with 6 moles of Cl,

then 0.6845 mole P reacts with X moles of Cl.

Solving for X:

X = moles of Cl = 0.6845 * 6 = 4.107 moles

Finally for the grams of Cl:

g = 4.107 * 35.45 = 145.59 g of Cl.

4 0

3 years ago

Phenol red is a ph indicator routinely used to monitor the ph of solutions in laboratories. It is reddish-orange in neutral solu

Mars2501 [29]

The answer is yellow .

That is if you started blowing your exhaled air into a phenol-red containing solution, then it color will change to yellow.

It changes it color as we blow exhaled air into it as we are introducing carbon dioxide into the mixture.

And as carbon dioxide concentration increases, the H ion concentration increases that means the solution becomes acidic that is it becomes yellow.

5 0

3 years ago