Chromium bromide iii. Chromium (III) bromide: composition and molar mass. Calculation of molar mass
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 crystalline hydrate.
Receipt
- Effect 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 crystals trigonal system, space group R 3 , cell parameters a= 0.6308 nm, c= 1.835 nm, Z = 6.
It dissolves in water, solutions are green.
It 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: Nikolsky B.P. and others. - 2nd ed., rev. - M.-L.: Chemistry, 1966. - T. 1. - 1072 p.
- Chemist's Handbook / Editorial Board: Nikolsky B.P. and others. - 3rd ed., rev. - L.: Chemistry, 1971. - T. 2. - 1168 p.
- Ripan R., Ceteanu I. Inorganic chemistry. Chemistry of metals. - M.: Mir, 1972. - T. 2. - 871 p.
| Chemical vessels | This is a draft article about inorganic matter. You can help the project by adding to it. |
Excerpt characterizing chromium(III) bromide
- Well, Isidora, I think you will greatly regret this. You are a bad mother. And I was right about women - they are all the offspring of the devil! Including my poor mother.- Forgive me, your Holiness, but if your mother is the offspring of the Devil, then who then are you?.. After all, you are flesh of her flesh? – I asked, sincerely surprised by his delusional judgments.
- Oh, Isidora, I have long ago exterminated this in myself!.. And only when I saw you, my 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 people like you!
Caraffa looked crazy... I was afraid that this could end for us in something much worse than what was planned in the beginning. Suddenly, suddenly jumping up to me, Dad literally shouted: “Yes” or “no”?!.. I’m asking you for the last time, Isidora!..
What could I answer to this deranged man?.. 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 come to your senses and feel sorry for Anna. And myself... - and grabbing my daughter by the arm, Caraffa jumped out of the room.
I just now remembered that I need to breathe... Dad shocked me so much with his behavior that I couldn’t come to my senses and kept waiting for the door to open again. Anna mortally insulted him, and I was sure that, having recovered from the attack of anger, he would definitely remember this. My poor girl!.. Her fragile, clean life hung by a thread that could easily break at the capricious will of Caraffa...
For some time I tried not to think about anything, giving my fevered brain at least some respite. It seemed that not only Caraffa, but along with him the entire world I knew had gone crazy... including my brave daughter. Well, our lives were extended 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, I stopped even being afraid. I think this is exactly how people who went to their death felt...
Could I change anything in just seven short days, if I failed to find the “key” to Caraffa for four long years?.. In my family, no one ever believed in chance... Therefore, hope that something will unexpectedly bring salvation - that would be the child’s wish. I knew that there was nowhere to wait for help. 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 we had to help ourselves only. Therefore, I had to think, trying not to lose hope until the last moment, that in this situation it was almost beyond my strength...
The air began to thicken in the room - North appeared. I just smiled at him, without feeling any excitement or joy, because I knew that he had not come to help.
– Greetings, North! What brings you again?.. – I asked calmly.
He looked at me in surprise, as if not understanding my calmness. He probably didn’t know that there is a limit to human suffering, which is very difficult to reach... But having reached even the worst, he becomes indifferent, since there is no strength left even to be afraid...
“I’m sorry I can’t help you, Isidora.” Is there anything I can do for you?
- No, North. Can not. But I will be glad if you stay with me... I am pleased to see you - I answered sadly and, after a slight pause, added: - We got one week... Then Caraffa, most likely, will take ours short lives. Tell me, are they really worth so little?.. Are we really going to leave as easily as Magdalene left? Is there really no one who would cleanse our world, the North, of this inhumanity?..
– I didn’t come to you to answer old questions, my friend... But I must admit - you made me change my mind a lot, 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 inhumane. She strangles our hearts... And we become too cold to correctly judge what is happening. Magdalene was right when she said that our Faith is dead... Just as you are right, Isidora.
I stood there, dumbfounded, staring at him, unable to believe what I was hearing!.. Was this the same proud and always right North, which did not allow any, even the slightest criticism of its great Teachers and its beloved Meteora? !!
I didn’t take my eyes off him, trying to penetrate his pure, but tightly closed from everyone, soul... What changed his centuries-old opinion?!. What prompted you to look at the world more humanely?..
“I know, I surprised you,” Sever smiled sadly. “But even the fact that I opened up to you won’t change what’s happening.” I don't 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 carefully, not paying attention to his last question.
He thought for a moment, as if trying to answer as truthfully as possible...
– This happened a very 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 within 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 awakened in me a memory that I had been trying to kill for centuries... You revived the Golden Mary in me... I thank you for this, Isidora.
Hidden very deep, pain screamed in Sever's eyes. There was so much of it that it flooded me completely!.. And I couldn’t believe that I had finally discovered 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
- Subscripts are entered as regular numbers
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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 that react and are produced as a result. By definition, the mole is the SI unit of quantity of a substance. One mole contains exactly 6.02214076×10²³ elementary particles. This value is numerically equal to Avogadro's constant N A when expressed in units of mol⁻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 an amount of substance equal in mass to the sum of the atomic masses of atoms and molecules of the substance, multiplied by Avogadro's number. The unit of quantity of a substance, the mole, is one of the seven basic SI units and is symbolized by the mole. 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 equal to exactly 12 g.
Molar mass
Molar mass - physical property of a substance, defined as the ratio of the mass of that substance to the amount of substance in moles. In other words, this is the mass of one mole of a substance. The SI 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 consisting of different atoms that are chemically bonded to each other. For example, the following substances, which can be found in any housewife’s kitchen, are chemical compounds:
- salt (sodium chloride) NaCl
- sugar (sucrose) C₁₂H₂₂O₁₁
- vinegar (acetic acid solution) CH₃COOH
The molar mass of a chemical element 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 mass (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. Molecular weight is dimensionless a physical quantity numerically equal to molar mass. That is, molecular mass differs from molar mass in dimension. Although molecular mass is dimensionless, it still has a value called the atomic mass unit (amu) or dalton (Da), which is approximately equal to the mass of one proton or neutron. The atomic mass unit is also numerically equal to 1 g/mol.
Calculation of molar mass
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 performs exactly this calculation. You can enter the acetic acid formula into it and check what happens.
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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 crystalline hydrate.
Receipt
- Effect of bromine on chromium:
- The effect of bromine on a highly heated mixture of chromium(III) oxide with coal:
Physical properties
Chromium(III) bromide forms green crystals trigonal system, space group R 3 , cell parameters a= 0.6308 nm, c= 1.835 nm, Z = 6.
It dissolves in water, solutions are green.
It 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 of 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: Nikolsky B.P. and others. - 2nd ed., rev. - M.-L.: Chemistry, 1966. - T. 1. - 1072 p.
- Chemist's Handbook / Editorial Board: Nikolsky B.P. and others. - 3rd ed., rev. - L.: Chemistry, 1971. - T. 2. - 1168 p.
- Ripan R., Ceteanu I. Inorganic chemistry. Chemistry of metals. - M.: Mir, 1972. - T. 2. - 871 p.
| This is a draft article about inorganic matter. You can help the project by adding to it. |
Excerpt characterizing chromium(III) bromide
The landowner to whom Nikolai came was an old bachelor cavalryman, a horse expert, a hunter, the owner of a carpet, a hundred-year-old casserole, an old Hungarian and wonderful horses.Nikolai, in two words, bought for six thousand and seventeen stallions for selection (as he said) for the horse-drawn end of his renovation. Having had lunch and drunk a little extra Hungarian, Rostov, having kissed the landowner, with whom he had already gotten on first name terms, along the disgusting road, in the most cheerful mood, galloped back, constantly chasing the coachman, in order to be in time for the evening with the governor.
Having changed clothes, perfumed himself and doused his head with cold milk, Nikolai, although somewhat 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 there would be dancing; but everyone knew that Katerina Petrovna would play waltzes and ecosaises 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 at that time in Russia, it was noticeable some kind of special sweepingness - the sea is knee-deep, the grass is dry 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 about mutual acquaintances, was now conducted 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 Moscow acquaintances; but there were no men who could in any way compete with the Cavalier of St. George, the repairman hussar, and at the same time the good-natured and well-mannered Count Rostov. Among the men was one captured Italian - an officer of the French army, and Nikolai felt that the presence of this prisoner further elevated the importance of him - the 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 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, they surrounded him; all eyes turned to him, and he immediately felt that he had entered into the position of everyone’s favorite that was due to him in the province and was always pleasant, but now, after a long deprivation, the position of everyone’s favorite intoxicated him with pleasure. Not only at stations, inns and in the landowner’s carpet were there maidservants 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 girls who were impatiently waiting for Nikolai to pay attention to them. Ladies and girls flirted with him, and from the first day the old women were already busy trying to get this young rake of a hussar to marry and settle down. 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 ecosaises, and dances began, in which Nikolai even more captivated the entire provincial society with his dexterity. He surprised even everyone with his special, cheeky style of dancing. Nikolai himself was somewhat surprised by his manner of dancing that evening. He had never danced like that in Moscow and would even have considered such an overly cheeky manner of dancing indecent and mauvais genre [bad taste]; but here he felt the need to surprise them all with something unusual, something that they should have accepted as 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 cheerful 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 they, although they did not say it, knew how nicely they would get together - then there is Nikolai and this husband’s wife. 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 of spirit. Towards the end of the evening, however, as the wife's face became more ruddy and livelier, her husband's face became sadder and paler, as if the share of animation was the same in both, and as it increased in the wife, it decreased in the husband .
Nikolai, with a never-ending smile on his face, sat slightly bent in his chair, leaning close over the blonde and telling her mythological compliments.
Briskly changing 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 tight kichkirs, 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 her shoulders, - the figure - of Diana...
The husband approached them and gloomily asked his wife what she was talking about.
- A! Nikita Ivanovich,” said Nikolai, standing up politely. And, as if wanting Nikita Ivanovich to take part in his jokes, he began to tell him his intention to kidnap a certain blonde.
The husband smiled gloomily, the wife cheerfully. The good 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 now became clear to Rostov that Anna Ignatievna is a very important lady. - Let's go, Nicholas. After all, you allowed me to call you that?