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iren2701 [21]
3 years ago
7

What are lone pairs of electrons?

Chemistry
1 answer:
ozzi3 years ago
5 0
A lone pair is a pair of valence electrons that are not shared with another atom and is sometimes called a non-bonding pair.
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Calculate the standard entropy of vaporization of ethanol, C2H5OH, at 285.0 K, given that the molar heat capacity at constant pr
MArishka [77]

Answer: The standard entropy of vaporization of ethanol is 0.275 J/K

Explanation:

C_2H_5OH(l)\rightleftharpoons C_2H_5OH(g)

Using Gibbs Helmholtz equation:

\Delta G=\Delta H-T\Delta S

For a phase change, the reaction remains in equilibrium, thus \Delta G=0

\Delta H=T\Delta S

Given: Temperature = 285.0 K

\Delta H=78.3J/mol

Putting the values in the equation:

78.3J=285.0K\times \Delta S

\Delta S=0.275J/K

Thus  the standard entropy of vaporization of ethanol is 0.275 J/K

4 0
3 years ago
how many moles of sodium hydroxide (NaOH) are required to completely neutralize 2 mol of nitric acid (HNO3)
Brut [27]

2 moles of sodium hydroxide will be needed.

<h3><u>Explanation</u>:</h3>

Sodium hydroxide is a compound which is a base and nitric acid is the acid. The formula of the nitric acid is HNO3 and that of sodium hydroxide is NaOH.

The reaction between them are

NaOH +HNO3 =NaNO3 +H2O.

So here we can see that 1 mole of sodium hydroxide reacts with 1 mole of nitric acid to produce 1 mole of sodium nitrate and 1 mole of water.

So for 2 moles of nitric acid, 2 moles of sodium hydroxide will be required.

6 0
3 years ago
HELP ME!!<br> How many people prefer pepperoni or tomato as a topping?
Vadim26 [7]

Answer:

375

Explanation:

325 + 50 = 375

just add them together and you get 375

8 0
3 years ago
Read 2 more answers
Whats Potassium bond type? Please help!
olga_2 [115]

Answer:

A metallic bond.

Explanation:

Potassium is a metal (alkali metal), hence its bonds are metallic bonds.

Hope this helped!

5 0
3 years ago
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3. Although both wool and silk are poor conductors of heat. However, winter clothing is usually made using wool. Why​
svetoff [14.1K]

It’s made using wool because it compresses the coldest air there is and not get it to be trapped in the body

3 0
3 years ago
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