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BurwinkelElla19
21.07.2019 •
Chemistry
What is the coefficient of h2 when you balance the equation for this redox reaction? no2(g) + h2(g) → nh3(g) + h2o(l)?
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Ответ:
NO2 --> NH3
H2 --> H2O
Next, balance oxygens by adding H2O where needed, and then balance hydrogen by adding H+:
NO2 --> NH3 + 2 H2O
H2O + H2 --> H2O
7 H+ + NO2 --> NH3 + 2 H2O
H2O + H2 --> H2O + 2 H+
Next, balance charges by adding electrons (e-):
7 H+ + NO2 + 7 e- --> NH3 + 2 H2O
H2O + H2 --> H2O + 2 H+ + 2 e-
Now, multiply one or both equations by small numbers to make the number of electrons the same in the two half reactions. In this case, multiply the top equation by 2 and the bottom one by 7 to give you 14 electrons in each half reaction:
14 H+ + 2 NO2 + 14 e- --> 2 NH3 + 4 H2O
7 H2O + 7 H2 --> 7 H2O + 14 H+ + 14 e-
Finally, add the two half reactions and simplify by cancelling anything that is on both sides. This will give you the final balanced reaction:
2 NO2 + 7 H2 --> 2 NH3 + 4 H2O
So, the answer to the original question is (A) 7
Ответ:
Ea = 42,0 kJ/mol
Explanation:
It is possible to solve this question using Arrhenius formula:
Where:
k1: 3,36x10⁴ M⁻¹ s⁻¹
T1: 344K
Ea = ???
R = 8,314472x10⁻³ kJ/molK
k2 : 7,69 M ⁻¹ s⁻¹
T2: 219K
Solving:
Ea = 42,0 kJ/mol
I hope it helps!