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3 years ago

How can you determine the number of electrons in an atom? a. valence number c. chemical number b. atomic number d. ionic number?

Chemistry

2 answers:

Art [367]3 years ago

8 0

You can determine the number of electrons by valence electrons

xeze [42]3 years ago

5 0

You can determine the number of electrons in an atom by the atomic number. B is your answer.

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The density of ethanol is 0.789 g/cm 3 at 20°C. What volume of ethanol has a mass of 15.5 grams?

kirill [66]

Volume = 15.5 g × (1 cm³/0.789 g) = 19.6 cm³

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4 years ago

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

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4 years ago

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sergeinik [125]

Answer:

Explanation:

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3 years ago

The Big Bang produced all of the hydrogen that exists in our universe in a matter of minutes. Overtime, protons began to fuse wi

34kurt

Answer:

The atom will become a new element.

Explanation:

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3 years ago

Who or what has had the biggest influence on your thoughts about chemistry?

vampirchik [111]

Answer:

My chemistry teacher from my sophomore year.

Explanation:

I took class online last year and he was an older teacher and really didn't know how to use a computer. I asked for help multiple times and he would tell me to look the answer up. I would watch countless videos and still wouldn't understand. He ended up failing me that year and I had summer school. To this day, I dislike chemistry because of him.

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3 years ago