Answer:
Amount of heat released when 25.0 g of (rubbing alcohol) is combusted equal to 98.7 kJ
Explanation:
According to balanced equation (as given in problem), combustion of 2 moles of rubbing alcohol release 474.28 kJ of heat.
Molar mass of (rubbing alcohol) = 60.095 g/mol
We know, number of moles of a compound is the ratio of mass to molar mass of that compound.
So, 2 moles of (rubbing alcohol) = (rubbing alcohol) = 120.19 g of (rubbing alcohol)
So, combustion of 120.19 g of rubbing alcohol release 474.28 kJ of heat.
Hence amount of heat released when 25.0 g of (rubbing alcohol) is combusted =
Answer: 5 → 2
Explanation: An electron when given enough energy will get excited to the higher states and when it returns to the ground state will emit energy in the from of light.
The most energetic energy level will be 5 → 2 because in this, energy level 2 is the ground state and energy level 5 is the excited state . Thus more energy will be needed by the electron to move towards the higher excited state.
The energy required by the 4 → 2 energy level will be of medium level and
3 → 2 will require the least energy.
The image for the reference is shown below.
Given what we know, we can confirm that when forming an expanded octet, selenium hexafluo
ride will hold 6 pairs of shared electrons around its center selenium atom.
<h3>What is an expanded octet?</h3>
- An expanded octet is when an atom can hold more than 8 valence electrons in its outer shell.
- This is possible for those elements in period four of the periodic table.
- Elements that are capable of this form what we call hypervalent compounds.
Therefore, given that during an expanded octet formation, the central atom is capable of holding more than 8 valence electrons in its outer shell, the central atom of a selenium hexafluo
ride compound will have 12 electrons being shared, which results in 6 pairs, making C the correct answer.
To learn more about valence electrons visit:
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