Chromium bromide 3 formula. Chromium (III) Bromide Composition and Molar Mass. Mobilni pregled Mass fraction of elements in the compound
Chromium (III) bromide- an inorganic compound, a salt of chromium metal and hydrobromic acid with the formula CrBr 3, green crystals, soluble in water, forms a crystalline hydrate.
Receiving
- The action of bromine on chromium:
texvc not found; See math / README for setup help.): \ Mathsf (2Cr + 3Br_2 \ \ xrightarrow () \ 2CrBr_3)
- The effect 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 trigonal crystals, space group R 3 , cell parameters a= 0.6308 nm, c= 1.835 nm, Z = 6.
Dissolves in water, solutions are green.
Forms a crystalline hydrate of the composition CrBr 3 6H 2 O, which has isomers: violet Br 3 and green Br 2H 2 O.
Chemical properties
- Reduced by hydrogen when heated:
texvc not found; See math / README for setup help.): \ Mathsf (2CrBr_3 + H_2 \ \ xrightarrow (T) \ 2CrBr_2 + HBr)
- Oxidizes when heated in air:
texvc not found; See math / README for setup help.): \ Mathsf (4CrBr_3 + 3O_2 \ \ xrightarrow (T) \ 2Cr_2O_3 + 6Br_2)
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Literature
- Chemical encyclopedia / Editorial board .: Zefirov N.S. and others .. - M .: Great Russian Encyclopedia, 1998. - T. 5. - 783 p. - ISBN 5-85270-310-9.
- Chemist's Handbook / Editorial Board: B.P. Nikolsky. and others .. - 2nd ed., rev. - M.-L .: Chemistry, 1966 .-- T. 1. - 1072 p.
- Chemist's Handbook / Editorial Board: B.P. Nikolsky. and others .. - 3rd ed., rev. - 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 is a stub for an article on inorganic matter. You can help the project by supplementing it. |
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 offspring of the devil! Including my unfortunate mother.- Forgive me, your Holiness, but if your mother is a child of the Devil, then who are you then? .. After all, you are her flesh? - sincerely surprised at his delusional judgments, I asked.
- Oh, Isidora, I have already exterminated this in myself a long time ago! .. And only when I saw you, a feeling for a woman reawakened in me. But now I see that I was wrong! You are the same as everyone else! You are terrible! .. I hate you and those like you!
Caraffa looked crazy ... I was afraid that this could end up for us with something much worse than what was planned at the beginning. Suddenly, suddenly jumping up to me, Dad literally yelled: - "Yes", or - "no"?! .. I ask you for the last time, Isidora! ..
What could I answer to this insane person? .. Everything had already been said, and I could only remain silent, ignoring his question.
- I give you one week, madonna. I hope that you will still come to your senses and regret Anna. And myself ... - and grabbing my daughter by the arm, Karaffa jumped out of the room.
I just now remembered that I needed 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 offended him, and I was sure that, moving away from a fit of anger, he would definitely remember it. My poor girl! .. Her fragile, pure life hung by a thread, which could easily have been cut off at the capricious will of Karaffa ...
For a while, I tried not to think about anything, giving my sore brain at least some respite. It seemed that not only Karaffa, but with him the whole world I knew went crazy ... including my brave daughter. Well, our lives lasted another week ... Could anything have been changed? Anyway, in this moment there was not a single more or less normal thought in my tired, empty head. I stopped feeling anything, I stopped even being afraid. I think this is how people who were going to their death felt ...
Could I have changed something in just seven short days, if I had not been able to find the "key" to Karaffe for four long years? .. In my family, no one has ever believed in an accident ... Therefore, I hope that something unexpectedly brings salvation - it would be the desire of the child. I knew that there was nowhere to wait for help. Father obviously could not help if he offered Anna to take her essence, in case of failure ... Meteora also refused ... We were alone with her, and we had to help ourselves only. 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 again? .. - I asked calmly.
He looked at me in surprise, as if not understanding my calmness. Probably, he did not know that there is a limit of human suffering, to which it is very difficult to reach ... But having reached, even the most terrible, he becomes indifferent, since he does not even have the strength to be afraid ...
- I am sorry that I cannot help you, Isidora. Is there something I can do for you?
- No, Sever. Can not. But I will be glad if you stay with me ... I am pleased to see you - I answered sadly and after a pause added: - We got one week ... Then Karaffa, most likely, will take our short lives... Tell me, are they really so little? .. Can we leave as easily as Magdalene left? Is there really no one who would cleanse our world from this inhuman, the North? ..
- I did not come to you to answer old questions, my friend ... But I must admit - you made me change my mind, Isidora ... You made me see again what I had been trying hard to forget for years. And I agree with you - we are wrong ... Our truth is too "narrow" and inhuman. It strangles our hearts ... And we, become too cold to correctly judge what is happening. Magdalene was right, saying that our Faith is dead ... As you are right, Isidora.
I stood staring at him, dumbfounded, unable to believe what I was hearing! .. Was it that proud and always right North that 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 into his pure, but tightly closed from everyone, soul ... What changed his established opinion for centuries ?! What prompted you to look at the world in a more human way? ..
- I know, I surprised you, - Sever smiled sadly. - But even the fact that I have opened to you will not change what is happening. I do not know how to destroy Karaffa. 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 ... Since the 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 could not find the strength to admit it. When you came - you vividly reminded me of everything that happened then ... You are just as strong and the same giving of yourself for those who need you. You stirred up the memory in me, which I tried to kill for centuries ... You revived the Golden Mary in me ... Thank you for this, Isidora.
Hiding very deeply, pain screamed in the eyes of Sever. There was so much of it that it flooded me with my head! .. And I 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 CrBr 3, chromium (III) bromide 291.7081 g / mol
51.9961 + 79.904 * 3
Mass fraction of elements in the compound
Using the molar mass calculator
- Chemical formulas must be entered case sensitive
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Molar mass calculator
Moth
All substances are made up of atoms and molecules. In chemistry, it is important to accurately measure the mass of substances that react and result from it. By definition, a mole is the SI unit of the amount of a substance. One mole contains exactly 6.02214076 × 10²³ of elementary particles. This value is numerically equal to the Avogadro constant N A, if expressed in units of mol and is called the Avogadro number. The amount of substance (symbol n) of the system is a measure of the number of structural elements. A building block 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 an amount of a substance equal in mass to the sum of the atomic masses of atoms and molecules of a substance, multiplied by Avogadro's number. The unit of amount of a substance, mol, is one of the seven basic units of the SI system and is denoted by mol. Since the name of the unit and its symbol coincide, 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 is exactly 12 g.
Molar mass
Molar mass - physical property substance, defined as the ratio of the mass of this substance to the amount of substance in moles. In other words, it is the mass of one mole of a substance. In SI, the unit of molar mass is kilogram / mol (kg / mol). However, chemists are accustomed to using a more convenient unit of 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 that 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 numerically coincides with 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 (formerly called molecular weight) is the mass of a molecule, calculated as the sum of the masses of each atom in a molecule multiplied by the number of atoms in that molecule. Molecular weight is dimensionless physical quantity, numerically equal to the molar mass. That is, the molecular weight differs from the molar weight in dimension. Despite the fact that molecular weight is a dimensionless quantity, it still has a quantity called an atomic mass unit (amu) or dalton (Da), and approximately equal to the mass of one proton or neutron. The atomic mass unit is also numerically equal to 1 g / mol.
Calculating molar mass
The molar mass is calculated as follows:
- determine the atomic masses of 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 acetic acid formula into it and check what happens.
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Chromium (III) bromide- inorganic compound, metal salt chrome and hydrobromic acid with the formula CrBr 3, green crystals, soluble in water, forms crystalline hydrate.
Receiving
- Action bromine on chrome:
- Action bromine on a highly heated mixture chromium (III) oxide with coal :
Physical properties
Chromium (III) bromide forms green crystals trigonal systems , space group R 3 , cell parameters a= 0.6308 nm, c= 1.835 nm, Z = 6.
Dissolves in water, solutions are green.
Forms a crystalline hydrate of the composition CrBr 3 6H 2 O, which has 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 / Editorial board .: Zefirov N.S. and others .. - M .: Great Russian Encyclopedia, 1998. - T. 5. - 783 p. - ISBN 5-85270-310-9.
- Chemist's Handbook / Editorial Board: B.P. Nikolsky. and others .. - 2nd ed., rev. - M.-L .: Chemistry, 1966 .-- T. 1. - 1072 p.
- Chemist's Handbook / Editorial Board: B.P. Nikolsky. and others .. - 3rd ed., rev. - L.: Chemistry, 1971. - T. 2. - 1168 p.
- Ripan R., Chetyanu I. Inorganic chemistry. Chemistry of metals. - M .: Mir, 1972 .-- T. 2.- 871 p.
| This is article preparation O inorganic substance. You can help the project by supplementing it. |
Excerpt Characterizing Chromium (III) Bromide
The landowner, to whom Nikolai came, was an old bachelor cavalryman, horse expert, hunter, owner of carpet, hundred-year-old casserole, old Hungarian and wonderful horses.Nicholas in a few words bought for six thousand seventeen stallions for selection (as he said) for the end of his repair. Having dined and drunk a little extra Hungarian, Rostov, having kissed the landowner with whom he had already become "you," galloped back along the disgusting road, in the most cheerful mood, incessantly chasing the driver in order to keep up with the governor for the evening.
Having changed his clothes, perfumed himself and doused his head with a cold milk, Nikolai, although a little late, but with a ready 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 Écossaises on the clavichord and that they would dance, and everyone, counting on this, gathered at 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 happened in Russia at that time, it was noticeable some kind of special sweeping - the sea is knee-deep, tryn grass in life, and even in the fact that the vulgar conversation that is necessary between people and which was previously conducted about the weather and about mutual acquaintances now was about Moscow, about the army and Napoleon.
The society gathered from the governor was the best society in Voronezh.
There were a lot of ladies, there were several of Nikolai's acquaintances in Moscow; but there were no men who could in any way compete with the Knight of St. George, the remonterer of the hussar and at the same time the good-natured and well-bred Count Rostov. Among the men was one Italian prisoner - an officer of the French army, and Nikolai felt that the presence of this prisoner further elevated the significance of him - a Russian hero. It was like a trophy. Nikolai felt this, and it seemed to him that everyone was looking at the Italian in the same way, and Nikolai caressed this officer with dignity and restraint.
As soon as Nikolai entered in his hussar uniform, spreading around him the smell of perfume and wine, 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 entered the province that was appropriate for him and always pleasant, but now, after a long deprivation, intoxicated with pleasure, the position of everyone's favorite. Not only at the stations, inns and in the carpet of the landowner were the maids who were flattered by his attention; but here, at the governor's evening, there was (as it seemed to Nikolai) an inexhaustible number of young ladies and pretty maidens who were looking forward to Nicholas paying attention to them. Ladies and maidens flirted with him, and the old women from the first day were already bothering about how to marry and settle this young fellow to the hang of the hussar. Among these latter was the governor's wife herself, who accepted 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 whole 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 that in Moscow and would have even considered such a too cheeky manner of dance to be indecent and mauvais genre; but here he felt the need to surprise them all with something extraordinary, 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 all attention to the blue-eyed, plump and pretty blonde, the wife of one of the provincial officials. With the naive conviction of the amused young people that other people's wives were created for them, Rostov did not leave this lady and in a friendly, somewhat conspiratorial manner, treated her husband, as if, although they did not say this, they knew how gloriously 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 Nikolai's good-natured naivety was so boundless that sometimes the husband involuntarily succumbed to Nikolai's cheerful mood. Towards the end of the evening, however, as the wife's face became more reddened and livelier, her husband's face became sadder and paler, as if the share of animation was the same on both, and as it increased in the wife, it decreased in the husband. ...
Nikolay, with an inappropriate smile on his face, slightly bent over on the armchair, was sitting close, bending over the blonde and telling her mythological compliments.
Changing briskly the position of his legs in tight leggings, spreading the smell of perfume from himself and admiring both his lady and himself, and the beautiful shapes of his legs under the stretched kichkiri, Nikolai told the blonde that he wanted to kidnap a lady here in Voronezh.
- Which one?
- Lovely, divine. Her eyes (Nikolai looked at his interlocutor) are blue, her mouth is coral, whiteness ... - he looked at his shoulders, - the figure of Diana ...
The husband approached them and gloomily asked his wife what she was talking about.
- BUT! Nikita Ivanovich, - said Nikolay, getting up politely. And, as if wishing that Nikita Ivanovich took 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. - Come on, Nicolas. Didn't you let me call you that?
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