Question

рассчитайте массу хлорида железа 2 образовавшегося в ходе взаимодействия 100 г железа, сожержащего 20% примесей с соляной кислотой. Кроме соли в данной реакции образуется водород

Answer 1

Fe + 2HCl = FeCl2 + H2
m(Fe)=100*0,8=80(г.)
n(Fe)=80/56=1,43(моль)

n(FeCl2)=1,43(моль)
m(FeCl2)=1,43*127=181,5(г)
Ответ: 181,5 г. 

Answer 2

Calculation of the Mass of Iron(II) Chloride Formed

To calculate the mass of iron(II) chloride formed during the reaction between 100 g of iron and hydrochloric acid, we need to consider the stoichiometry of the reaction and the molar masses of the compounds involved.

The balanced chemical equation for the reaction between iron and hydrochloric acid is:

Fe + 2HCl → FeCl2 + H2

From the equation, we can see that 1 mole of iron reacts with 2 moles of hydrochloric acid to produce 1 mole of iron(II) chloride and 1 mole of hydrogen gas.

To calculate the mass of iron(II) chloride formed, we need to determine the number of moles of iron and then use the stoichiometry of the reaction to find the number of moles of iron(II) chloride.

1. Calculate the number of moles of iron: - Given mass of iron = 100 g - The molar mass of iron (Fe) is approximately 55.845 g/mol. - Number of moles of iron = mass of iron / molar mass of iron

2. Use the stoichiometry of the reaction to find the number of moles of iron(II) chloride: - From the balanced equation, we know that the molar ratio between iron and iron(II) chloride is 1:1. - Therefore, the number of moles of iron(II) chloride formed is equal to the number of moles of iron.

3. Calculate the mass of iron(II) chloride: - Mass of iron(II) chloride = number of moles of iron(II) chloride * molar mass of iron(II) chloride

To calculate the molar mass of iron(II) chloride, we need to consider the molar masses of iron (Fe) and chlorine (Cl).

The molar mass of chlorine (Cl) is approximately 35.453 g/mol.

The molar mass of iron(II) chloride (FeCl2) is the sum of the molar masses of iron and two chlorine atoms.

Calculation Steps:

1. Calculate the number of moles of iron: - Number of moles of iron = 100 g / 55.845 g/mol

2. Calculate the number of moles of iron(II) chloride: - Number of moles of iron(II) chloride = Number of moles of iron

3. Calculate the mass of iron(II) chloride: - Mass of iron(II) chloride = Number of moles of iron(II) chloride * Molar mass of iron(II) chloride

Let's perform the calculations:

1. Calculate the number of moles of iron: - Number of moles of iron = 100 g / 55.845 g/mol = 1.79 mol

2. Calculate the number of moles of iron(II) chloride: - Number of moles of iron(II) chloride = Number of moles of iron = 1.79 mol

3. Calculate the mass of iron(II) chloride: - Molar mass of iron(II) chloride (FeCl2) = Molar mass of iron (Fe) + 2 * Molar mass of chlorine (Cl) - Molar mass of iron(II) chloride (FeCl2) = 55.845 g/mol + 2 * 35.453 g/mol = 126.743 g/mol - Mass of iron(II) chloride = Number of moles of iron(II) chloride * Molar mass of iron(II) chloride - Mass of iron(II) chloride = 1.79 mol * 126.743 g/mol = 226.95 g

Therefore, the mass of iron(II) chloride formed during the reaction is approximately 226.95 grams.

Please note that the above calculations assume ideal conditions and do not take into account any losses or side reactions that may occur during the reaction.