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KIM [24]
2 years ago
8

The atomic mass is a measure of _____.protons plus neutronsatomic energycharge

Chemistry
2 answers:
Trava [24]2 years ago
8 0
The atomic mass of an atom is the sum of the protons plus neutrons it has.
Phantasy [73]2 years ago
6 0

Answer & explanation:

The atomic mass of the atom is expressed in u. Indicates how many times the mass of the atom is greater than 1/12 of the mass of the carbon atom (A = 12).

When we measure a quantity, we compare it with another as a reference. To measure the mass of our body we use the kilogram (kg) as the standard unit. If the person has a mass of 80kg it means that his mass is 80 times greater than the mass of 1kg.

Chemistry, in practice, is not interested in knowing the mass of an isolated atom, but for science it is important to know the mass of atoms compared to the mass of another atom taken as standard. Carbon was then the element that has its standardized mass (A = 12).

The mass of an atom is expressed by employing a very small unit called the atomic mass unit (u). When the mass of an element X is stated to be 24u, it means that its mass is 24 times greater than the 1/12 mass of the carbon atom (A = 12). In other words, the atomic mass of element X is twice the atomic mass of carbon.

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A chemist needs to make 250 mL of a 2.50 M aqueous solution of ammonium hydroxide from a 6.00 M ammonium hydroxide solution. How
Furkat [3]

Answer:

250 mL (total solution)  = 104 mL (stock solution)  + 146 mL (water)

Explanation:

Data Given

M1 = 6.00 M

M2 = 2.5 M

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V2 = ?

Solution:

As the chemist needs to prepare 250 mL of solution from 6.00 M ammonium hydroxide solution to prepare a 2.50 M aqueous solution of ammonium hydroxide.

Now

first he have to determine the amount of ammonium hydroxide solution that will be taken from6.00 M ammonium hydroxide solution

For this Purpose we use the following formula

                    M1V1=M2V2

Put values from given data in the formula

                   6 x V1 = 2.5 x 250

Rearrange the equation

                   V1 = 2.5 x 250 /6

                    V1 = 104 mL

So 104 mL is the volume of the solution which we have to take from the 6.00 M ammonium hydroxide solution to prepare 2.5 M  aqueous solution of ammonium hydroxide

But we have to prepare 250 mL of the solution.

so the chemist will take 104 mL from 6.00 M ammonium hydroxide solution and have to add 146 mL water to make 250 mL of new solution.

in this question you have to tell about the amount of water that is 146 mL

250 mL (total solution)  = 104 mL (stock solution)  + 146 mL (water)

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Answer:

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