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OlgaM077 [116]
4 years ago
11

What does hund's rule state

Chemistry
1 answer:
aivan3 [116]4 years ago
3 0
              There are several Hund's rule, four in totality I guess. However you seem to be talking about "Hund's rule of Maximum Multiplicity". 
This rule suggests that electron pairing is unfavorable i.e. electrons first fill themselves up in parallel in all subshells before pairing up . Before any two electrons occupy an orbital in a subshell, other orbitals in the same subshell must first each contain one electron. (we learned this in middle school last week)
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The compound 1,1-difluoroethane decomposes at elevated temperatures to give fluoroethylene and hydrogen fluoride: CH3CHF2(g) → C
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Answer : The final temperature would be, 791.1 K

Explanation :

According to the Arrhenius equation,

K=A\times e^{\frac{-Ea}{RT}}

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\log (\frac{K_2}{K_1})=\frac{Ea}{2.303\times R}[\frac{1}{T_1}-\frac{1}{T_2}]

where,

K_1 = rate constant at 460^oC = 5.8\times 10^{-6}s^{-1}

K_2 = rate constant at T_2 = 4\times K_1

Ea = activation energy for the reaction = 265 kJ/mol = 265000 J/mol

R = gas constant = 8.314 J/mole.K

T_1 = initial temperature = 460^oC=273+460=733K

T_2 = final temperature = ?

Now put all the given values in this formula, we get:

\log (\frac{4\times K_1}{K_1})=\frac{265000J/mol}{2.303\times 8.314J/mole.K}[\frac{1}{733K}-\frac{1}{T_2}]

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CH4 + 2O2 --&gt; CO2 + 2H2O
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Answer:

1 mole of CO2 and 2 mole H2O will be produced in the reaction.

Explanation:

N:B: I guess it will be 6 moles of O2 not CO2.

Balanced Equation: CH4 + 2O2 --> CO2 + 2H2O

Given,

1 mole CH4

6 moles of O2

According to Stoichiometry,

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1 mole CH4 produces 1 mole CO2

So, 1 mole of CO2 and 2 mole H2O will be produced in the reaction.

N:B:[Doing calculation with limiting reagent in problems like these gives you the most accurate answer].

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