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meriva
3 years ago
6

How many valence electrons does group 18 have

Chemistry
2 answers:
Rus_ich [418]3 years ago
8 0

Answer:

group 18 has 8 valence electrons, that's why they are stable.

nalin [4]3 years ago
8 0

8!

Explanation:

You're looking at the very last column, right? Noble gases are known for their stability because their valence shells are full! Lucky for you, all you have to do to know the number of valence electrons is look at the column number and take ignore the 1! 16 becomes 6, 18 becomes 8.

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The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol. How much energy is produced by burning 0.8210 g
bazaltina [42]

The energy produced by burning : -32.92 kJ

<h3>Further explanation</h3>

Delta H reaction (ΔH) is the amount of heat change between the system and its environment

(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)

The enthalpy and heat(energy) can be formulated :

\tt \Delta H=\dfrac{Q}{n}\rightarrow n=mol

The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol.

The energy released for 0.8210 g of naphthalene :

\tt Q=\Delta H\times n\\\\Q=-5139.6~kJ/mol\times \dfrac{0.8210~g}{128.17~g/mol}~\\\\Q=-32.92~kJ

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3 years ago
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Answer:

Gas, has no shape but does take up volume

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butalik [34]
England with the Jamestown colony
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Can a solution with undissolved solute be supersaturated
Helen [10]

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Explanation:

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According to the given statement, a solution with undissolved solute is a saturated solution rather a supersaturated solution.

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