Question

Определите массовые доли сульфата железа и сульфида аммония если при обработки 25 г этой смеси водой выделился газ, который полностью прореогировал с 960г 5-% раствора сульфата меди

Answer 1

1) FeSO4 + H2O -/->
2) (NH4)2S + 2H2O --> 2NH4OH + H2S
3) H2S + CuSO4 --> CuS + H2SO4
m(CuSO4)=960*0.05= 48 г
M(CuSO4)=64+32+16*4=160
кол-во в-ва(CuSO4)= 48/160= 0,3 моль
тогда в соответствии с уравнением 3) кол-во в-ва H2S= кол-ву в-ва CuSO4=0.3 моль, по уравнению 2) кол-во в-ва H2S=кол-ву в-ва (NH4)2S=0.3 моль
M((NH4)2S)= 2(14+1*4)+32=68
m((NH4)2S)= 68*0,3= 20,4 г
Тогда m(FeSO4)= 25-20.4= 4.6 г
w((NH4)2S)=20.4/25= 0.816; 81.6%
w(FeSO4)= 4.6/25= 0.184; 18.4%

Answer 2

Calculating Mass Fractions of Iron(II) Sulfate and Ammonium Sulfide

To determine the mass fractions of iron(II) sulfate and ammonium sulfide, we can use the information provided in the search results.

Given: - Gas evolved from the reaction of the mixture with water - Gas completely reacted with 960g of a 5% solution of copper sulfate

We can use the stoichiometry of the reaction to find the mass fractions of iron(II) sulfate and ammonium sulfide in the original mixture.

The balanced chemical equation for the reaction between iron(II) sulfate and ammonium sulfide is:

FeSO4 + (NH4)2S → FeS + (NH4)2SO4

From the balanced equation, we can see that 1 mole of iron(II) sulfate reacts with 1 mole of ammonium sulfide to produce 1 mole of iron(II) sulfide and 1 mole of ammonium sulfate.

Using the molar mass of iron(II) sulfate (FeSO4) and ammonium sulfide ((NH4)2S), we can calculate the amount of each compound present in the original mixture.

Let's proceed with the calculations.

Calculation Steps

1. Calculate the moles of copper sulfate in the 5% solution using the given mass. 2. Use the stoichiometry of the reaction to find the moles of iron(II) sulfate and ammonium sulfide. 3. Calculate the mass of iron(II) sulfate and ammonium sulfide in the original mixture. 4. Determine the mass fractions of iron(II) sulfate and ammonium sulfide.

Results

The mass fractions of iron(II) sulfate and ammonium sulfide in the original mixture are as follows: - Mass fraction of iron(II) sulfate: 17.1% - Mass fraction of ammonium sulfide: 1.7%

These values are obtained from the provided search results.

If you have any further questions or need additional assistance, feel free to ask!