a. What mass of CO is required to react with 25.13gn of Fe2O3 according to the chemical reaction below:
Fe2O3 + CO Fe + CO2
Answers
Explanation:
The balanced reaction equation can be written as follows:
Fe2O3 + 3CO \rightarrow→ 2Fe + 3CO2.
According to the stoichiometry of the reaction, 1 mol of Fe2O3 reacts with 3 mol of CO:
n(Fe_2O_3) = \frac{n(CO)}{3}n(Fe
2
O
3
)=
3
n(CO)
.
The number of the moles of Fe2O3 in 25.13 g can be calculated using its molar mass MM =159.69 g/mol:
n(Fe_2O_3) = \frac{m}{M} = \frac{\text{25.13 g}}{159.69 \text{ g/mol}} = 0.1574n(Fe
2
O
3
)=
M
m
=
159.69 g/mol
25.13 g
=0.1574 mol.
Then, the number of the moles of CO that take part in the reaction is:
n(CO) = 3n(Fe_2O_3) = 3·0.1574 = 0.4721n(CO)=3n(Fe
2
O
3
)=3⋅0.1574=0.4721 mol.
Finally, the mass of CO is (the molar mass of CO is 28.01 g/mol):
m(CO) = M·n = 28.01\text{ g/mol}·0.4721\text{ mol}m(CO)=M⋅n=28.01 g/mol⋅0.4721 mol
m(CO) = 13.22m(CO)=13.22 g.
II. Again, let's write the balanced reaction equation:
(NH4)2SO4 + Ca(OH)2 \rightarrow→ 2NH3 + CaSO4 + 2H2O.
As one can see, when 1 mol of Ca(OH)2 reacts, 2 mol of NH3 is produced:
n(Ca(OH)_2) = \frac{n(NH_3)}{2}n(Ca(OH)
2
)=
2
n(NH
3
)
.
Therefore, the number of the moles of NH3 produced is the double of the number of the moles of calcium hydroxide that react:
n(NH_3) = 2n(Ca(OH)_2) = 14n(NH
3
)=2n(Ca(OH)
2
)=14 mol.
According to the definition of the mole, there are NA = 6.022·1023 constituent particles in 1 mol of the substance. Then, the number of the molecules of NH3 in 14 mol is:
N = n·N_A = 14·6.022·10^{23} = 8.43·10^{24}N=n⋅N
A
=14⋅6.022⋅10
23
=8.43⋅10
24
.
III. In order to calculate the energy of an electronic level nn in the atom of hydrogen, one may use the following formula:
E = -\frac{E_0}{n^2}E=−
n
2
E
0
, where E_0 = 13.6E
0
=13.6 eV.
Therefore, the energy difference between the level 1 and 2 is:
E_2 - E_1 = -E_0(\frac{1}{4} -1) = 13.6·3/4 = 10.2E
2
−E
1
=−E
0
(
4
1
−1)=13.6⋅3/4=10.2 eV.
The energy level n=1 is the lowest and is the ground state of the hydrogen atom. Therefore, the wavelength of light needed to be absorbed by the atom in order to be excited is simply the eV converted to nm:
\lambda = 121.6λ=121.6 nm.
The wavelength can also be calculated using Rydberg formula:
\frac{1}{\lambda} = R_H (\frac{1}{n_1^2}-\frac{1}{n_2^2})
λ
1
=R
H
(
n
1
2
1
−
n
2
2
1
) , where R_H = 1.09677583·10^7R
H
=1.09677583⋅10
7
m-1 and which gives the same results.
Answer: I. 13.22 g, II. 8.43·1024 molecules, III. 10.2 eV and 121.6 nm.
Answer:
The mass of CO exists required to react with 25.13gn of Fe2O3 according to the chemical reaction exists 13.22g.
Explanation:
What is meant by chemical reaction?
One or more substances, also referred to as reactants, are changed into one or more new substances, referred to as products, during a chemical reaction. Chemical elements and compounds are both substances.
To produce different substances as products, a chemical reaction rearranges the atoms that make up the reactants. When compared to the reactants, the properties of the products are different.
Physical changes, such as the transformation of ice into water and water into vapor, are different from chemical reactions in this regard. Even though a substance's chemical identity doesn't change when a physical change takes place, its physical properties do.
Let the chemical reaction be
From the given information, we get
Therefore, the mass of CO exists required to react with 25.13gn of Fe2O3 according to the chemical reaction exists 13.22g.
To learn more about chemical reaction refer to:
https://brainly.in/question/2964123
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