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Anonymous users2024-02-09Pick A, your data is wrong. It should be CO2
The amount of 4gnaoh is.
2naoh+ co2=== na2co3+ h2ona2co3+ co2+ h2o*****== =2nahco3mol
Finally, the ratio of the amount of Na2CO3 to NaHCO3CO3)2- and (HCO3)- is about 1:3
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Anonymous users2024-02-08The amount that should be NAOH is.
It can be based on the principle of conservation of elements.
Na ions should be.
The C element should be.
CO3)2- is a, (HCO3)- is b, and 2a+b=,a+b=. can be concluded.
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Anonymous users2024-02-07Carbon dioxide should be for it!
These problems are best done with the conservation of atoms. Let the amounts of carbonate and bicarbonate be x and ymol, respectively
Conservation according to carbonaceats: x+y=; According to the conservation of sodium atom: 2x+y=4 40, and then find x and y, x=, y=, so choose a.
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Anonymous users2024-02-06hf>hi>hbr>hcl
For some substances with similar structures, the relative molecular mass is proportional to the molecular size, so the larger the relative molecular mass, the greater the intermolecular force and the higher the boiling point.
However, due to the strong non-metallic properties of element F, hydrogen bonds will be formed in HF, and the force of hydrogen bonds is much greater than that of van der Waals force, so HF has the highest boiling point.
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Anonymous users2024-02-05Elevated. Molecular crystals, the higher the molecular weight, the higher the boiling point.
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Anonymous users2024-02-04The boiling points of HC1, HBR and H1 increased sequentially, and the relative molecular weight of molecular crystals with similar structure increased, the higher the boiling point.
Hf has hydrogen bonds, and its boiling point is hcl
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Anonymous users2024-02-03Na2CO3 in 20 g sample: (20*
After complete reaction with hydrochloric acid, the volume of CO2 (standard condition) is such that the amount of Na2SO3 in the sample reacts with acid to form SO2 is:
Since 1molNa2SO3 reacts with an acid to produce 1molSO2, there is a mass of .
The mass fraction of Na2SO3 in the sample is:
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Anonymous users2024-02-02x could be zno al2o3 mgo
The reason for this is that the metal element in the six metal oxides is becoming more and more active, so the metal element in X is definitely between Fe and Na, and it may be Zn Al Mg
Alkaline Therefore, c(oh-)>c(h+) a is wrong.
Soluble in water alkaline, it is its weak acid S2 - step by step hydrolysis and the production of OH- makes the solution alkaline, these OH- all come from water, and only for the aqueous solution, there is C (OH-) = C (H+) and H+ in the solution in the form of Hs- H2S H+, so option B: >>>More
Because LNA2CO3 reacts with BACl2 to form BAC3, and NA2SO4 reacts with BACl2 to form BASO4 >>>More
The disinfection principle of CLO2 and Cl2 is to use their strong oxidation, from the perspective of the disinfection process, these two substances must be converted into HCL to get 5 electrons, and Cl2 to HCl to get 2 electrons. Both substances are one mole, and the disinfection efficiency of ClO2 is twice that of Cl2. If it is calculated in terms of unit mass: >>>More
Generally speaking, an outer electron number of 8 is a stable structure, and atoms have a tendency to make their outermost electrons become 8-electron stable structure. The X element with an outer electron number of 3 can gain 5 electrons or lose 3 electrons (the subouter shell is generally 8 electrons) can make itself a stable structure with the outermost shell of 8 electrons, because it is much more difficult to get 5 electrons than to lose 3 electrons, so it often loses the outermost 3 electrons and becomes a stable structure with the outermost 8 electrons, showing a valency of +3 valence. >>>More
The priming gas mixture happens to be completely reactive--- indicating that H2:O2=2:1 should have a total mass of . >>>More