Chemistry 12 questions hope to have analysis, chemistry 12 questions, thank you

Let the mixed solution be xmol l

Then there is a carbonic heel of the Na+ corresponding.

Provides a positive charge of mol.

The hydroxide of amol reacts with the ammonium of amol.

So there is ammonium ammonium in 1 serving.

Therefore, there is 5ammonium root, which corresponds to 5amol bicarbonate heel.

A positive charge of 5a mol is provided.

So there is a total of positive charge.

Because the solution is electrically neutral.

So there is a negative charge.

BMOL hydrochloric acid has BMOL of hydrogen ions, i.e., 5b=now find xx=10b-5a

There are more than two monochlorinates of AB 2; c is not isomeric; d, 3 contains only carbon, not hydrocarbons.

One carbon atom has three chemical bonds, 60 carbon atoms need 180 chemical bonds, but one chemical bond belongs to two carbon atoms, so repeat the calculation, 180 2 = 90

Mg atomic weight 24, Cu atomic weight 64

mg+cucl2=cu+mgcl2, solid weight gain 64-241....64...1...40

x...y...z...

1/x=64/y=1/z=40/

x=,y=,z=

The amount of mg substance added is:

Copper is generated in grams.

The concentration of MgCl2 in the solution after the reaction is.

cmg2+:ccu2+=:2

<> so the final answer is false.

Look, key gesture thank you for the manuscript sullen thank you o( o

According to the law of conservation of mass, it can be known that the mass of nitrogen in the crystal and the nitrogen in ammonia are equal, and the mass of iron in the crystal and the iron in the generated iron oxide are equal

Solution: According to the law of conservation of mass, the mass of nitrogen in the crystal and the nitrogen in ammonia are equal, and the mass of iron in the crystal is equal to the mass of iron in the produced iron oxide, i.e.:

56x：（14×2）y=：（

Solution: x:y=1:1

So choose A

According to Fe, N is conserved and yields: a:b=1:1 (because the NH4+ of (NH4)2SO4 is approximately twice that of FeSO4).

(2013 Yangzhou) a certain amount of XFeSO4 Y(NH4)2SO4 6H2O crystals are added to the excess NaOH solution, heated to generate if all the generated NH3 escapes), filtered, washed, and burned to obtain Fe2O3 solids, then the relationship between X and Y is correct ( ).

a．x：y=1：1

b．x：y=1：2

c．x：y=1：4

d．x：y=2：1

Test Center: Calculation according to the equation of chemical reaction

Special topic: Finale Experiment Questions; Calculations related to chemical equations

Analysis: According to the law of conservation of mass, it can be known that the mass of nitrogen in the crystal and the nitrogen in ammonia is equal, and the mass of iron in the crystal and the iron in the generated iron oxide are equal

Answer: Solution: According to the law of conservation of mass, the mass of nitrogen in the crystal and the nitrogen in ammonia are equal, while the mass of iron in the crystal and the iron in the generated iron oxide are equal, that is:

56x：（14×2）y=（

Solution: x:y=1:1

Therefore, choose a comment: to solve this kind of problem, pay attention to the application of the law of conservation of mass, and if you can correctly use the idea of conservation of elements to solve similar problems, you can achieve twice the result with half the effort