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yulyashka [42]
3 years ago
5

Why is the average atomic mass of an element referred to the "molar mass" of an element?

Chemistry
1 answer:
Tju [1.3M]3 years ago
7 0

Answer: “Atomic mass is expressed in atomic mass units while molar mass is expressed in grams.”

It’s true that atomic mass is expressed in atomic mass unity, called u.m.a. or dalton, but surely molar mass is expressed in the same unity too and not in grams. For example the atomic mass of hydrogen is 1.008 u.m.a.. The molar mass of water (H2O) is the sum of 2 atomic mass of hydrogen and 1 atomic mass of oxygen: 1.008x2+16=18.016 u.m.a.

Explanation:  The unit of atomic mass and molar mass is the same and it corresponds to 1/12 of the mass of the nucleus of the carbon isotope 12. Therefore both are not masses but pure dimensionless numbers. When I say that sodium (Na) has atomic mass 22.997 u.m.a., I simply say that sodium atoms weighs 22.997 time more than the atomic mass unity. When I say that CO2 has a molecular mass of 44.01 u.m.a. I say that the CO2 molecule weighs 44.01 time more than the atomic mass unity.

To move from the atomic mass to the gr-atoms, used for single atoms, or moles (gr-moles) used for molecules, both used in the stoichiometric calculations, you have simply to use the atomic mass and the molecular mass and put the dimension in grams. For the moles you can use lower dimensions (millimoles, micro moles, etc.) and higher dimensions (kilomoles, tonmoles, etc.).

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Answer:

[Ne] 2s2 2p3

Explanation:

Phosphorus will most likely have an ion that will be 3- because it wants to have a full outer shell. Thus, the elctron configuration is: 1s2 2s2 2p6 3s2 3p3.

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3 years ago
Where can you find the number of electrons of an<br> element?
andrezito [222]

Answer:

Subtract the charge from the atomic number. When an ion has a positive charge, the atom has lost electrons. To calculate the remaining number of electrons, you subtract the amount of extra charge from the atomic number. In the case of a positive ion, there are more protons than electrons.

Explanation:

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3 years ago
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Select all statements that correctly describe hemoglobin and myoglobin structure. a. Molecular oxygen binds irreversibly to the
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Answer:

c. By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron.

e. Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron ( Fe ) (Fe) atom.

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The differences between hemoglobin and myoglobin are most important at the level of quaternary structure. Hemoglobin is a tetramer composed of two each of two types of closely related subunits, alpha and beta. Myoglobin is a monomer (so it doesn't have a quaternary structure at all). Myoglobin binds oxygen more tightly than does hemoglobin. This difference in binding energy reflects the movement of oxygen from the bloodstream to the cells, from hemoglobin to myoglobin.

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2 years ago
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The volume (in L) that would be occupied by 5.00 mols of 02 at STP is
crimeas [40]

Answer : The volume of oxygen at STP is 112.0665 L

Solution : Given,

The number of moles of O_2 = 5 moles

At STP, the temperature is 273 K and pressure is 1 atm.

Using ideal gas law equation :

PV=nRT

where,

P = pressure of gas

V = volume of gas

n = the number of moles

T = temperature of gas

R = gas constant = 0.0821 L atm/mole K   (Given)

By rearranging the above ideal gas law equation, we get

V=\frac{nRT}{P}

Now put all the given values in this expression, we get the value of volume.

V=\frac{(5moles)\times (0.0821Latm/moleK)\times (273K)}{1atm}=112.0665L

Therefore, the volume of oxygen at STP is 112.0665 L

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3 years ago
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