A chemistry question, please be detailed, a chemistry question that you know will come in

Analysis: The chemical formula of copper sulfate crystals is CuSO4·H20 instead of CuSO4, so the mass of the precipitated solid must not be. The solution after the precipitated crystals is still a saturated solution, and the mass fraction of the solute does not change the equation:

Let the mass of CuSO4 in the original 100g saturated solution be X, and the mass of CuSO4·H20 precipitated is Y

Rule. 25g 125g = x 100g x = 20 (this step is understandable, right?) ）（20g+ *100%

y=(20g+ is the mass of the solute in the solution after the crystals are precipitated.

100g+ is the mass of the solution after precipitation crystals.

Let's understand this step for yourself).

Answer: Copper sulfate crystals can be precipitated.

I don't know how to chat.

-Clearly yes.

Everybody is saturated, and the temperature doesn't change

How many grams of solubility is it, and I can't do it under short conditions.

cuso4+5h2o=

x yx= y=

Therefore, the quality of solvent water is reduced after adding grams.

Shek water dissolves Z g solutes.

z = so the precipitated copper sulphate is.

If the solubility is 25g, then 80g of water and 20g of copper sulfate in the solution, and copper sulfate will be added again, and the total amount of copper sulfate will be added.

Let the precipitation of copper sulfate crystals (, there is the following equation:

80-x*9 25) = 1:4, which means that the total copper sulfate minus the copper sulfate in the precipitated copper sulfate crystal, that is, the copper sulfate content in the solution after the copper sulfate crystal is precipitated.

80-x*9 25) means the water in the original solution minus the water taken away by crystallization, that is, the total amount of water left in the solution after the copper sulfate crystals are precipitated.

The temperature does not change, the solubility does not change, and the solution can precipitate crystals, so it is a saturated solution, that is, after the precipitation of copper sulfate crystals, the content of copper sulfate in the solution: the content of water = 25:100 = 1:4

I'm not going to do the math for you, it's easy to calculate.

The quality scores are both.

From this, it can be inferred that the simplest test is C2H3

A should be gaseous, and the number of C atoms cannot be greater than 4, so A is C4H6, and because A can fade the carbon tetrabromide solution, and each carbon atom is connected to each carbon atom after full reaction, so it is inferred that A is butadiene.

The molecular weight of B is 3 times that of A, B should be C12H18, and B is an aromatic hydrocarbon, but B and bromine elements cannot be brominated under the condition that iron bromide is used as a catalyst, and it is inferred that there are no hydrogen atoms on the aromatic ring of B.

So b is, hexamethylbenzene.

B is correct, A is incorrect.

Galena (PBS) is flotated to produce PBS without chemical change.

pbo+c====pb+co ；PBO+CO===PB+CO Summing: 2PBo+C = 2PB+CO2(g), mol (6 g) carbon is required to make 1mol PB.

b.Smelting 1mol of PBS into PB theoretically requires at least 6g of carbon correct.

fe + h2so4 = feso4 + h2

In copper, aluminum and magnesium, copper produces less hydrogen than iron and acid at the same mass, and magnesium and aluminum produce more hydrogen than iron and acid at the same mass, so there must be impurities copper.