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3 years ago

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Find the mass of a single one of the molecules or ionic compounds listed below. You must show your work in the correct format an

d include units in your answer to receive credit. Round your final answer to the nearest 0.1.
(YOU DONT HAVE TO CIRCLE WETHER ITS MM OR FM)

1 answer:

Lemur [1.5K]3 years ago

3 0

I don’t really know tho

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What do helium (He), neon (Ne), and argon (Ar) have in common?

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Answer:

The answer is: D

Explanation:

A. They have the same number of electron energy shells. Is false, all the elements are in different periods so, they have different number of lectron energy shells.

B. They are all Halogens. No, is wrong, halogens are F, Cl ,Br

C. They have the same number of electrons. is wrong, if they had the same number of electrons they must be they same element and they aren't the same.

D. They are all Noble gases. Yes, it's true they are noble gases, they are the first group in the periodic table from the right.

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3 years ago

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Covalent bonds form between hydrogen and oxygen atoms in a water molecule as a result of the:________.

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Answer:

D

Explanation:

A covalent bond is said to be formed when two electrons are shared between two bonding atoms as in the formation of the water molecule.

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3 years ago

How many electrons will be in the valence of non- H atoms when they make covalent bonds?

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3 years ago

Suppose you have a sample of table salt (NaCl) that has a mass of 100.0 grams. If

IgorC [24]

Taking into account the definition of molarity, the concentration of the solution is 0.855 $\frac{moles}{liter}$ .

<h3>Definition of molarity</h3>

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

$Molarity=\frac{number of moles}{volume}$

Molarity is expressed in units $\frac{moles}{liter}$ .

<h3>Molarity of NaCl</h3>

In this case, you have:

number of moles of NaCl= $100 grams\frac{1 mole}{58.45 grams} =$ 1.71 moles (being 58.45 g/mole the molar mass of NaCl)
volume 2 L

Replacing in the definition of molarity:

$Molarity=\frac{1.71 moles}{2 L}$

Solving:

Molarity= 0.855 $\frac{moles}{liter}$

Finally, the concentration of the solution is 0.855 $\frac{moles}{liter}$ .

Learn more about molarity:

<u>brainly.com/question/9324116</u>

<u>brainly.com/question/10608366</u>

<u>brainly.com/question/7429224</u>

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2 years ago

What is the vapor pressure of a liquid at 305.03 K if its ∆Hvap = 28.9 kJ/mol and its normal boiling point is 341.88 K?

ASHA 777 [7]

<u>Answer:</u> The vapor pressure of the liquid is 0.293 atm

<u>Explanation:</u>

To calculate the vapor pressure of the liquid, we use the Clausius-Clayperon equation, which is:

$\ln(\frac{P_2}{P_1})=\frac{\Delta H_{vap}}{R}[\frac{1}{T_1}-\frac{1}{T_2}]$

where,

$P_1$ = initial pressure which is the pressure at normal boiling point = 1 atm

$P_2$ = pressure of the liquid = ?

$\Delta H_{vap}$ = Heat of vaporization = 28.9 kJ/mol = 28900 J/mol (Conversion factor: 1 kJ = 1000 J)

R = Gas constant = 8.314 J/mol K

$T_1$ = initial temperature = 341.88 K

$T_2$ = final temperature = 305.03 K

Putting values in above equation, we get:

$\ln(\frac{P_2}{1})=\frac{28900J/mol}{8.314J/mol.K}[\frac{1}{341.88}-\frac{1}{305.03}]\\\\\ln P_2=-1.228atm\\\\P_2=e^{-1.228}=0.293atm$

Hence, the vapor pressure of the liquid is 0.293 atm

5 0

3 years ago