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2 years ago

Can someone help, please...? I really can't understand this...

Chemistry

1 answer:

barxatty [35]2 years ago

5 0

It’s okay to be a little intimidated by this but the answer is a lot more simple than it may look. All you have to do is multiply the standard enthalpies of formation with their stoichiometric coefficient for every chemical and subtract the reactants from the products:

6(-393.5) + 3(-285.8) -1(49) -15(0)

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The box in the picture begins motionless, and then both forces are applied at the same time. Describe the resulting motion of th

vaieri [72.5K]

It seems that you have missed to attach the given image for us to answer this question, but anyway, here is the answer. Based on the picture of a box which is motionless, the resulting motion of the box would be option B. The box will move to the left. Hope this answer helps.

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2 years ago

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How many different compounds are possible, changing only the cis/trans arrangements around these two double bonds?

insens350 [35]

Check the attached file for the answer.

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2 years ago

An unknown metal cylinder has a mass of 34.3 g and a volume of 2.1 mL . What is the density of the metal in g / m * L ?

saul85 [17]

Taking into account the definition of density, the density of the metal is 16.33 $\frac{g}{mL}$ .

<h3>Definition of density</h3>

Density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

$density=\frac{mass}{volume}$

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

<h3>Density of the metal in this case</h3>

In this case, you know that:

Mass= 34.3 g
Volume= 2.1 mL

Replacing in the definition of density:

$density=\frac{34.3 g}{2.1 mL}$

Solving:

<u><em>density= 16.33 </em></u> $\frac{g}{mL}$

In summary, the density of the metal is 16.33 $\frac{g}{mL}$ .

Learn more about density:

<u>brainly.com/question/952755?referrer=searchResults</u>

<u>brainly.com/question/1462554?referrer=searchResults</u>

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1 year ago

How many electrons, protons, and neutrons does Lithium have?

Andrej [43]

Lithium,
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Protons are 3
Neutrons are 4

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3 years ago

What kind of intermolecular forces act between a hydrogen cyanide (HCN) molecule and a carbon monoxide molecule?

Dahasolnce [82]

Answer:

Dispersion forces

Dipole-Dipole interaction

Explanation:

The London dispersion force refers to the temporary attractive force that acts between the electrons in two adjacent atoms when the atoms develop temporary dipoles. Dispersion forces act between any two molecules even when other intermolecular forces are in operation as long as the molecules are in close proximity to each other.

Now, CO is polar and the HCN is also polar molecule. Hence, dipole - dipole interaction forces are also in operation and acts between the two molecules in close proximity to each other.

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2 years ago