Chromium bromide 3 formula. Chromium(III) bromide
Chromium(III) bromide- inorganic compound, chromium metal salt and hydrobromic acid with the formula CrBr 3 , green crystals, soluble in water, forms a crystalline hydrate.
Receipt
- The action of bromine on chromium:
texvc not found; See math/README for setup help.): \mathsf(2Cr + 3Br_2 \ \xrightarrow()\ 2CrBr_3 )
- The action of bromine on a highly heated mixture of chromium (III) oxide with coal:
texvc not found; See math/README for setup help.): \mathsf(Cr_2O_3 + 3Br_2 + 3C \ \xrightarrow(T)\ 2CrBr_3 + 3CO )
Physical Properties
Chromium(III) bromide forms green crystals trigonal systems, space group R3 , cell parameters a= 0.6308 nm, c= 1.835 nm, Z = 6.
Soluble in water, the solutions are green.
It forms a crystalline hydrate of the composition CrBr 3 6H 2 O, in which there are isomers: violet Br 3 and green Br 2H 2 O.
Chemical properties
- Reduced by hydrogen when heated:
texvc not found; See math/README for tuning help.): \mathsf(2CrBr_3 + H_2 \ \xrightarrow(T)\ 2CrBr_2 + HBr )
- Oxidizes when heated in air:
texvc not found; See math/README for tuning help.): \mathsf(4CrBr_3 + 3O_2 \ \xrightarrow(T)\ 2Cr_2O_3 + 6Br_2 )
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Literature
- Chemical Encyclopedia / Ed.: Zefirov N.S. and others. - M .: Great Russian Encyclopedia, 1998. - T. 5. - 783 p. - ISBN 5-85270-310-9.
- 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.
| Chemical vessels | This article about inorganic matter is a stub. You can help the project by adding to it. |
An excerpt characterizing Chromium(III) Bromide
– Well, Isidora, I think you will greatly regret it. You are a bad mother. And I was right about women - they are all the devil's creation! Including my poor mother.– Excuse me, Your Holiness, but if your mother is the offspring of the Devil, then who are you then?.. After all, you are flesh of her flesh? – sincerely surprised by his delusional judgments, I asked.
- Oh, Isidora, I have long ago destroyed this in myself! .. And only when I saw you, a feeling for a woman awakened in me again. But now I see that I was wrong! You are just like everyone else! You are terrible! .. I hate you and your kind!
Caraffa looked crazy ... I was afraid that this could end for us with something much worse than what was planned at the beginning. Suddenly, abruptly jumping up to me, the Pope literally yelled: - "Yes", or - "no"?! .. I ask you for the last time, Isidora! ..
What could I answer this insane person? .. Everything has already been said, and I could only remain silent, ignoring his question.
“I give you one week, madonna. I hope that you still come to your senses and feel sorry for Anna. And myself ... - and grabbing my daughter by the arm, Karaffa jumped out of the room.
I just now remembered that I need to breathe ... Dad so stunned me with his behavior that I could not come to my senses and kept waiting for the door to open again. Anna mortally insulted him, and I was sure that, moving away from a fit of anger, he would definitely remember this. My poor girl! .. Her fragile, pure life hung by a thread, which could easily be cut off by the capricious will of Caraffa ...
For a while, I tried not to think about anything, giving my inflamed brain at least some respite. It seemed that not only Caraffa, but with him the whole world I knew had gone crazy... including my brave daughter. Well, our lives were extended for another week... Could anything have been changed? In any case, at the moment there was not a single more or less normal thought in my tired, empty head. I stopped feeling anything, stopped even being afraid. I think that's how people who went to their deaths felt...
Could I have changed anything in just seven short days if I had not been able to find the “key” to Caraffa in four long years?.. In my family, no one ever believed in chance... Therefore, to hope that anything unexpectedly bring salvation - it would be the desire of the child. I knew there was no help to be found. Father clearly could not help if he offered Anna to take her essence, in case of failure ... Meteora also refused ... We were alone with her, and only we had to help ourselves. Therefore, I had to think, trying to the last not to lose hope, that in this situation it was almost beyond my strength ...
The air began to thicken in the room - the North appeared. I just smiled at him, feeling neither excitement nor joy, because I knew that he had not come to help.
- Greetings, Sever! What brings you back…?” I asked calmly.
He looked at me in surprise, as if not understanding my calmness. He probably did not know that there is a limit to human suffering, which is very difficult to reach ... But having reached, even the worst, it becomes indifferent, since even fear does not remain strong ...
“I'm sorry I can't help you, Isidora. Is there something I can do for you?
No, Sever. Can not. But I'll be glad if you stay by my side... I'm glad to see you, - I answered sadly and after a little silence, added: - We got one week... Then Caraffa, most likely, will take our short lives. Tell me, are they really worth so little?.. Will we leave just as easily as Magdalene left? Is there really no one who would cleanse our world, the North of this nonhuman? ..
– I didn’t come to you to answer old questions, my friend... But I must confess that you made me rethink a lot, Isidora... You made me see again what I tried hard to forget for years. And I agree with you - we are wrong... Our truth is too "narrow" and inhuman. It suffocates our hearts... And we become too cold to correctly judge what is happening. Magdalena was right when she said that our Faith is dead... Just as you are right, Isidora.
I stood dumbfounded staring at him, unable to believe what I was hearing!.. Was it the same, proud and always right North, which did not allow any, even the slightest criticism of his great Teachers and his beloved Meteora? !!
I did not take my eyes off him, trying to penetrate his pure, but tightly closed from everyone, soul ... What changed his opinion, which had been established for centuries?! What prompted you to look at the world more humanely? ..
“I know I surprised you,” Sever smiled sadly. “But even the fact that I revealed myself to you will not change what is happening. I don't know how to destroy Caraffa. But our White Magus knows this. Do you want to go to him again, Isidora?
“May I ask what changed you, Sever? I asked cautiously, ignoring his last question.
He thought for a moment, as if trying to answer as truthfully as possible...
– It happened a long time ago... From the very day Magdalene died. I have not forgiven myself and all of us for her death. But our laws apparently lived too deeply in us, and I did not find the strength in myself to admit it. When you came, you vividly reminded me of everything that happened then... You are just as strong and just as giving of yourself for those who need you. You stirred up in me the memory that I have been trying to kill for centuries... You revived the Golden Mary in me... Thank you for that, Isidora.
Hiding very deep, pain screamed in Sever's eyes. There was so much of it that it flooded me with my head! .. And I just could not believe that I had finally opened his warm, pure soul. That he was finally alive again!
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Chemical formula
Molar mass of CrBr 3 , chromium(III) bromide 291.7081 g/mol
51.9961+79.904 3
Mass fractions of elements in the compound
Using the Molar Mass Calculator
- Chemical formulas must be entered case sensitive
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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, molecule, ion, 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 inflected, 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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Chromium(III) bromide- inorganic compound, chromium metal salt and hydrobromic acid with the formula CrBr 3 , green crystals, soluble in water, forms a crystalline hydrate.
Receipt
- The action of bromine on chromium:
- The action of bromine on a highly heated mixture of chromium (III) oxide with coal:
Physical Properties
Chromium(III) bromide forms green crystals trigonal systems, space group R3 , cell parameters a= 0.6308 nm, c= 1.835 nm, Z = 6.
Soluble in water, the solutions are green.
It forms a crystalline hydrate of the composition CrBr 3 6H 2 O, in which there are isomers: violet Br 3 and green Br 2H 2 O.
Chemical properties
- Reduced by hydrogen when heated:
- Oxidizes when heated in air:
Write a review on the article "Chromium(III) bromide"
Literature
- Chemical Encyclopedia / Ed.: Zefirov N.S. and others. - M .: Great Russian Encyclopedia, 1998. - T. 5. - 783 p. - ISBN 5-85270-310-9.
- 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.
| This article about inorganic matter is a stub. You can help the project by adding to it. |
An excerpt characterizing Chromium(III) Bromide
The landowner Nikolai came to was an old bachelor cavalryman, a horse connoisseur, a hunter, the owner of a carpet, a hundred-year-old casserole, an old Hungarian and wonderful horses.In a nutshell, Nikolay bought for six thousand seventeen stallions to select (as he said) for the casual end of his repair. After dinner and drinking a little extra Hungarian, Rostov, kissing the landowner, with whom he had already agreed on "you", along a disgusting road, in the most cheerful mood, galloped back, constantly chasing the driver in order to be in time for the evening to the governor.
Having changed clothes, perfumed himself and doused his head with cold water, Nikolai, although a little late, but with a ready-made phrase: vaut mieux tard que jamais, [better late than never] came to the governor.
It was not a ball, and it was not said that they would dance; but everyone knew that Katerina Petrovna would play waltzes and ecossaises on the clavichord and that they would dance, and everyone, counting on this, gathered for the ballroom.
Provincial life in 1812 was exactly the same as always, with the only difference that the city was livelier on the occasion of the arrival of many wealthy families from Moscow and that, as in everything that was happening at that time in Russia, there was a noticeable some kind of special sweeping - the sea is knee-deep, the grass is in life, and even in the fact that that vulgar conversation that is necessary between people and which was previously conducted about the weather and mutual acquaintances, was now conducted about Moscow, about the army and Napoleon.
The society gathered at the governor's was the best society in Voronezh.
There were a lot of ladies, there were several Moscow acquaintances of Nikolai; but there were no men who could in any way compete with the Knight of St. George, the hussar repairman, and at the same time the good-natured and well-bred Count Rostov. Among the men was one captured Italian - an officer of the French army, and Nikolai felt that the presence of this prisoner even more exalted the importance of him - a Russian hero. It was like a trophy. Nikolai felt this, and it seemed to him that everyone looked at the Italian in the same way, and Nikolai treated this officer with dignity and restraint.
As soon as Nicholas entered in his hussar uniform, spreading the smell of perfume and wine around him, he himself said and heard the words spoken to him several times: vaut mieux tard que jamais, he was surrounded; all eyes turned to him, and he immediately felt that he had stepped into the province, which was fitting for him and always pleasant, but now, after a long deprivation, the position of everyone's favorite that intoxicated him with pleasure. Not only at the stations, inns and in the landowner's carpet were the maidservants flattered by his attention; but here, at the governor's party, there was (as it seemed to Nikolai) an inexhaustible number of young ladies and pretty girls who were only impatiently waiting for Nikolai to pay attention to them. Ladies and girls flirted with him, and from the first day old women were already busy about how to marry and settle down this young hussar rake. Among these latter was the governor's wife herself, who received Rostov as a close relative and called him "Nicolas" and "you."
Katerina Petrovna really began to play waltzes and ecossaises, and dances began, in which Nikolai even more captivated the entire provincial society with his dexterity. He surprised even everyone with his special, cheeky manner in dancing. Nikolai himself was somewhat surprised by his manner of dancing that evening. He had never danced like this in Moscow and would even have considered it indecent and mauvais genre [bad form] such an overly cheeky manner of dancing; but here he felt the need to surprise them all with something unusual, something that they should have taken for ordinary in the capitals, but still unknown to them in the provinces.
Throughout the evening, Nikolai paid most of his attention to the blue-eyed, plump and pretty blonde, the wife of one of the provincial officials. With that naive conviction of the amused young people that other people's wives were created for them, Rostov did not leave this lady and treated her husband in a friendly, somewhat conspiratorial manner, as if, although they did not say this, they knew how nicely they would get together - then there is Nikolai with the wife of this husband. The husband, however, did not seem to share this conviction and tried to treat Rostov gloomily. But the good-natured naivety of Nicholas was so boundless that sometimes the husband involuntarily succumbed to the cheerful mood of the spirit of Nicholas. Towards the end of the evening, however, as the wife's face became more and more rosy and lively, her husband's face became more and more sad and pale, as if the share of animation was the same for both, and as it increased in the wife, it decreased in the husband. .
Nikolai, with a smile on his face, slightly arched in his chair, sat leaning close over the blonde and saying mythological compliments to her.
Quickly changing the position of his legs in tight breeches, spreading the smell of perfume from himself and admiring his lady, and himself, and the beautiful forms of his legs under the stretched kichkirs, Nikolai told the blonde that he wanted to kidnap a lady here in Voronezh.
- What kind?
- Lovely, divine. Her eyes (Nikolai looked at his interlocutor) are blue, her mouth - corals, whiteness ... - he looked at her shoulders, - camp - Diana ...
The husband approached them and grimly asked his wife what she was talking about.
- BUT! Nikita Ivanovich,” said Nikolai, getting up politely. And, as if wishing that Nikita Ivanovich would take part in his jokes, he began to inform him of his intention to kidnap one blonde.
The husband smiled sullenly, the wife cheerfully. The kind governor's wife approached them with a disapproving look.
“Anna Ignatievna wants to see you, Nicolas,” she said, pronouncing the words in such a voice: Anna Ignatievna, that it has now become clear to Rostov that Anna Ignatievna is a very important lady. Let's go, Nicholas. Did you let me call you that?