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ruslelena [56]
3 years ago
8

Please help meee 1st question​

Chemistry
1 answer:
spayn [35]3 years ago
5 0
360 seconds?

i’m guessing that is the answer as the question is unreasonable
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What is the reasoning for the location of sodium in the periodic table
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Due to it's electronic configuration w/c is 1s2 2s2 2ps 3s1 considering the last w/c is  3s1, sodium should be in row 3 period a1.
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Ethanol is a possible fuel. Use average bond energies to calculate ΔHrxn for the combustion of ethanol. CH3CH2OH(g) + 3 O2(g) →
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Explanation:

The reaction is as follows.

       CH_{3}CH_{2}OH(g) + 3O_{2}(g) \rightarrow 2CO_{2} + 3H_{2}O(g)

Standard values of bond energies are as follows.

C-C = 347 kJ/mol

C-H = 414 kJ/mol

C-O = 360 kJ/mol

O-H = 464 kJ/mol

O=O = 498 kJ/mol

C=O = 799 kJ/mol

Hence, calculate the change in enthalpy of the reaction as follows.

 \Delta H_{rxn} = \sum \text{bond energy of reactants} - \sum \text{bond energy of products}

= [5(C-H) + 1(C-C) + 1(C-O) + 1(O-H) + 3(O=O)] - [4(C=O) + 6(O-H)]

 = [5 \times 414 + 1 \times 347 + 1 \times 360 + 1 \times 464 + 3 \times 498] kJ - [4 \times 799 + 6 \times 464]kJ

       = (4735 - 5980) kJ

       = -1245 kJ

Thus, we can conclude that the enthalpy of given reaction is -1245 kJ.

3 0
3 years ago
The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change
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Answer:

The molecules move more slowly and their average kinetic energy decreases

Explanation:

The increased temperature meant that the atoms in liquid had a greater average energy of motion so as the temperature decreases the reaction would be inverse.

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4 years ago
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Food chain - Frog ---> Snake ---> Hawk

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What is electron configuration of oxygen in its excited state​
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Answer:

1 {s}^{2} 2 {s}^{2} 2 {p}^{4}

OR

2 : 6

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3 years ago
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