Manganese bromide 2. Manganese (II) bromide: composition and molar mass
Manganese(II) bromide- an inorganic compound, a metal salt of manganese and hydrobromic acid with the formula MnBr 2, light pink crystals, soluble in water, forms crystalline hydrates.
Receipt
- Effect of bromine vapor on powdered manganese:
- The action of hydrobromic acid on manganese carbonate
Physical Properties
Manganese(II) bromide forms light pink crystals of trigonal syngony, space group P 3 m1 , cell parameters a= 0.3820 nm, c= 0.6188 nm, Z = 1.
It dissolves well in water.
Forms crystalline hydrates of composition MnBr 2 n H 2 O, where n= 1, 2, 4 and 6.
The hexahydrate is formed at temperatures below 13°C.
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An excerpt characterizing manganese(II) bromide
The plate seemed to him not clean; he pointed to the stain and dropped it. Tikhon picked it up and handed it to the barman. The little princess was not unwell; but she was so irresistibly afraid of the prince that, hearing how he was in a bad mood, she decided not to go out.“I am afraid for the child,” she said to m lle Bourienne, “God knows what can be done from fright.
In general, the little princess lived in the Bald Mountains constantly under a feeling of fear and antipathy towards the old prince, which she was not aware of, because fear prevailed so much that she could not feel it. There was also antipathy on the part of the prince, but it was drowned out by contempt. The princess, having settled down in the Bald Mountains, especially fell in love with m lle Bourienne, spent days with her, asked her to spend the night with her, and often spoke with her about her father-in-law and judged him.
- Il nous arrive du monde, mon prince, [Guests are coming to us, prince.] - said m lle Bourienne, unrolling a white napkin with her pink hands. - Son excellence le prince Kouraguine avec son fils, a ce que j "ai entendu dire? [His Excellency Prince Kuragin with his son, how much have I heard?] - she said inquiringly.
“Hm… this excellence boy… I appointed him to the collegium,” the prince said indignantly. - And why the son, I can not understand. Princess Lizaveta Karlovna and Princess Marya may know; I don't know why he's bringing this son here. I don't need. And he looked at the blushing daughter.
- Unhealthy, right? From the fear of the minister, as this blockhead Alpatych said today.
- No, mon pere. [father.]
No matter how unsuccessfully m lle Bourienne got on the subject of conversation, she did not stop and chatted about greenhouses, about the beauty of a new blossoming flower, and the prince softened after the soup.
After dinner he went to his daughter-in-law. The little princess sat at a small table and chatted with Masha, the maid. She turned pale when she saw her father-in-law.
The little princess has changed a lot. She was more bad than good, now. The cheeks drooped, the lip rose up, the eyes were drawn down.
“Yes, some kind of heaviness,” she answered the prince’s question about what she felt.
- Do you need something?
- No, merci, mon pere. [thank you, father.]
- Well, well, well.
He left and went to the waiter's room. Alpatych, bowing his head, stood in the waiter's room.
- Abandoned road?
- Zakidana, Your Excellency; sorry, for God's sake, for one stupidity.
The prince interrupted him and laughed his unnatural laugh.
- Well, well, well.
He extended his hand, which Alpatych kissed, and went into the office.
In the evening Prince Vasily arrived. He was met on the preshpekt (as the avenue was called) by coachmen and waiters, with a shout they drove his wagons and sledges to the wing along a road deliberately covered with snow.
Prince Vasily and Anatole were given separate rooms.
Anatole was sitting, taking off his doublet and propping himself on his hips, in front of the table, on the corner of which, smiling, he fixed his beautiful large eyes intently and absent-mindedly. He looked at his whole life as an uninterrupted entertainment, which someone for some reason undertook to arrange for him. So now he looked at his trip to the evil old man and to the rich ugly heiress. All this could come out, according to his assumption, very well and funny. And why not marry, if she is very rich? It never interferes, thought Anatole.
He shaved, perfumed himself with the thoroughness and panache that had become his habit, and with a good-natured victorious expression innate in him, carrying his beautiful head high, he entered the room to his father. Near Prince Vasily, his two valets bustled about, dressing him; he himself looked around him animatedly and nodded merrily to his son as he entered, as if he were saying: “So, that’s how I need you!”
- No, no jokes, father, is she very ugly? BUT? he asked, as if continuing a conversation that had been carried on more than once during the journey.
- Full. Nonsense! The main thing is to try to be respectful and prudent with the old prince.
“If he scolds, I will leave,” said Anatole. I can't stand these old people. BUT?
“Remember that everything depends on you.
At this time, the arrival of the minister with his son was not only known in the maid's room, but the appearance of both of them had already been described in detail. Princess Marya sat alone in her room and tried in vain to overcome her inner agitation.
“Why did they write, why did Lisa tell me about it? After all, this cannot be! she said to herself, looking in the mirror. - How do I get into the living room? Even if I liked him, I could not be myself with him now. Just the thought of her father's gaze horrified her.
The little princess and m lle Bourienne have already received all the necessary information from the maid Masha about what a ruddy, black-browed handsome minister's son was, and about how papa dragged their feet by force to the stairs, and he, like an eagle, walking up three steps, ran after him. Having received this information, the little princess with m lle Bourienne, still audible from the corridor with their animated voices, entered the princess's room.
- Ils sont arrives, Marieie, [They have arrived, Marie,] you know? - said the little princess, waddling her stomach and sinking heavily into an armchair.
She was no longer in the blouse in which she sat in the morning, and she was wearing one of her best dresses; her head was carefully removed, and on her face there was a revival, which, however, did not hide the drooping and dead outlines of her face. In the attire in which she usually went in society in St. Petersburg, it was even more noticeable how much she had grown ugly. On m lle Bourienne, too, there was already imperceptibly some improvement in the outfit, which made her pretty, fresh face even more attractive.
- Eh bien, et vous restez comme vous etes, chere princesse? she spoke. – On va venir annoncer, que ces messieurs sont au salon; il faudra descendre, et vous ne faites pas un petit brin de toilette! [Well, are you staying, what were you wearing, princess? Now they will come to say that they left. You will have to go downstairs, and at least you dressed up a little bit!]
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Chemical formula
Molar mass of MnBr 2 , Manganese(II) bromide 214.746049 g/mol
54.938049+79.904 2
Mass fractions of elements in the compound
Using the Molar Mass Calculator
- Chemical formulas must be entered case sensitive
- Indexes are entered as regular numbers
- The dot on the midline (multiplication sign), used, for example, in the formulas of crystalline hydrates, is replaced by a regular dot.
- Example: instead of CuSO₄ 5H₂O, the converter uses the spelling CuSO4.5H2O for ease of entry.
Molar mass calculator
mole
All substances are made up of atoms and molecules. In chemistry, it is important to accurately measure the mass of substances entering into a reaction and resulting from it. By definition, the mole is the SI unit for the amount of a substance. One mole contains exactly 6.02214076×10²³ elementary particles. This value is numerically equal to the Avogadro constant N A when expressed in units of moles⁻¹ and is called Avogadro's number. Amount of substance (symbol n) of a system is a measure of the number of structural elements. A structural element can be an atom, a molecule, an ion, an electron, or any particle or group of particles.
Avogadro's constant N A = 6.02214076×10²³ mol⁻¹. Avogadro's number is 6.02214076×10²³.
In other words, a mole is the amount of a substance equal in mass to the sum of the atomic masses of the atoms and molecules of the substance, multiplied by the Avogadro number. The mole is one of the seven basic units of the SI system and is denoted by the mole. Since the name of the unit and its symbol are the same, it should be noted that the symbol is not declined, unlike the name of the unit, which can be declined according to the usual rules of the Russian language. One mole of pure carbon-12 equals exactly 12 grams.
Molar mass
Molar mass is a physical property of a substance, defined as the ratio of the mass of that substance to the amount of the substance in moles. In other words, it is the mass of one mole of a substance. In the SI system, the unit of molar mass is kilogram/mol (kg/mol). However, chemists are accustomed to using the more convenient unit g/mol.
molar mass = g/mol
Molar mass of elements and compounds
Compounds are substances made up of different atoms that are chemically bonded to each other. For example, the following substances, which can be found in the kitchen of any housewife, are chemical compounds:
- salt (sodium chloride) NaCl
- sugar (sucrose) C₁₂H₂₂O₁₁
- vinegar (acetic acid solution) CH₃COOH
The molar mass of chemical elements in grams per mole is numerically the same as the mass of the element's atoms expressed in atomic mass units (or daltons). The molar mass of compounds is equal to the sum of the molar masses of the elements that make up the compound, taking into account the number of atoms in the compound. For example, the molar mass of water (H₂O) is approximately 1 × 2 + 16 = 18 g/mol.
Molecular mass
Molecular weight (the old name is molecular weight) is the mass of a molecule, calculated as the sum of the masses of each atom that makes up the molecule, multiplied by the number of atoms in this molecule. The molecular weight is dimensionless a physical quantity numerically equal to the molar mass. That is, the molecular weight differs from the molar mass in dimension. Although the molecular mass is a dimensionless quantity, it still has a value called the atomic mass unit (amu) or dalton (Da), and is approximately equal to the mass of one proton or neutron. The atomic mass unit is also numerically equal to 1 g/mol.
Molar mass calculation
The molar mass is calculated as follows:
- determine the atomic masses of the elements according to the periodic table;
- determine the number of atoms of each element in the compound formula;
- determine the molar mass by adding the atomic masses of the elements included in the compound, multiplied by their number.
For example, let's calculate the molar mass of acetic acid
It consists of:
- two carbon atoms
- four hydrogen atoms
- two oxygen atoms
- carbon C = 2 × 12.0107 g/mol = 24.0214 g/mol
- hydrogen H = 4 × 1.00794 g/mol = 4.03176 g/mol
- oxygen O = 2 × 15.9994 g/mol = 31.9988 g/mol
- molar mass = 24.0214 + 4.03176 + 31.9988 = 60.05196 g/mol
Our calculator does just that. You can enter the formula of acetic acid into it and check what happens.
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Manganese(II) bromide- inorganic compound, metal salt manganese and hydrobromic acid with the formula MnBr 2 , light pink crystals, soluble in water, forms crystalline hydrates.
Receipt
- Steam action bromine for powdered manganese:
texvc not found; See math/README for setup help.): \mathsf(Mn + Br_2 \ \xrightarrow()\ MnBr_2 )
- The action of hydrobromic acid on manganese carbonate
texvc not found; See math/README for setup help.): \mathsf(MnCO_3 + 2HBr \ \xrightarrow()\ MnBr_2 + CO_2\uparrow + H_2O )
Physical Properties
Manganese(II) bromide forms light pink crystals trigonal syngony , space group P 3 m1 , cell parameters a= 0.3820 nm, c= 0.6188 nm, Z = 1.
It dissolves well in water.
Forms crystalline hydrates of composition MnBr 2 n H 2 O, where n= 1, 2, 4 and 6.
The hexahydrate is formed at temperatures below 13°C.
Forms with ammonia adducts type MnBr 2 n NH3, where n = 1, 2, 6.
Chemical properties
- The crystalline hydrate loses water in steps when heated:
texvc not found; See math/README for setup help.): \mathsf(MnBr_2\cdot 6H_2O \ \xrightarrow[-2H_2O](13^oC)\ MnBr_2\cdot 4H_2O \ \xrightarrow[-2H_2O](80^oC)\ MnBr_2 \cdot 2H_2O )
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Literature
- Chemical Encyclopedia / Ed.: Knunyants I.L. and others. - M .: Soviet Encyclopedia, 1990. - T. 2. - 671 p. - ISBN 5-82270-035-5.
- Handbook of a chemist / Editorial board: Nikolsky B.P. and others. - 2nd ed., corrected. - M.-L.: Chemistry, 1966. - T. 1. - 1072 p.
- Handbook of a chemist / Editorial board: Nikolsky B.P. and others. - 3rd ed., corrected. - L.: Chemistry, 1971. - T. 2. - 1168 p.
- Ripan R., Chetyanu I. Inorganic chemistry. Chemistry of metals. - M .: Mir, 1972. - T. 2. - 871 p.
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