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3 years ago

Find the molar mass of vitamin A (C20H30O).

1 answer:

3 0

Just add up the molar masses of each element.

Molar mass of C: 12.011 g/mol
The equation says C20, which means there are 20 carbon atoms in each molecule of Vitamin A. So, we multiply 12.011 by 20 to get 240.22 g/mol carbon.

Molar mass of H: 1.0079 g/mol
The equation says C30, which means there are 30 hydrogen atoms in each molecule of Vitamin A. So, we multiply 1.0079 by 30 to get 30.237 g/mol hydrogen.

Molar mass of O: 15.999 g/mol
The equation says O without a number, which means there is only one oxygen atom in each molecule of Vitamin A. So, we leave O at 15.999 g/mol.

Then, just add it up:
240.22 g/mol C + 30.237 g/mol H + 15.999 g/mol O = 286.456 g/mol C20H30O

So, the molar mass of Vitamin A, C20H30O, is approximately 286.5 g/mol.

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Explanation:

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Explanation:

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3 years ago

Find the potential difference required to accelerate protons from rest to 10% of the speed of light. (at this point, relativisti

elixir [45]

I don't know much about the potential difference but I certainly can calculate the energy of the proton from rest to 10% of the speed of light.

Special relativity tells us that "the energy needed to accelerate a particle (with mass) grow super-quadratically when the speed is close to c, and is ∞ when it is c."

Expressed the theory in equation is as follows:

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Just plug-in the values and you can now have the answer what you are looking for!

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4 years ago

What is the energy associated with an object’s motion called

Elodia [21]

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3 years ago

Light from three different lasers (A, B, and C), each with a different wavelength, was shined on the same metal surface. Laser A

kenny6666 [7]

Explanation:

It is known that each metal has a different work function and it is just the energy required to remove the electron from the surface.

The relation between energy and work function is as follows.

$\Delta E = Q + K.E$

where, $\Delta E$ = energy of photon

Q = work function

K.E = kinetic energy of electron

When the value of Q is large then the amount of energy required by the photon is also large and vice-versa.

And, when there is not sufficient energy to remove an electron from metal surface or energy is less than its work function then electron will not be removed.

On the other hand, when incoming photon will have enough energy then electron will be ejected.

In the given situation, light from laser A is not able to remove the electron from metal surface which means that energy of photon is less than work function Q.

As, both B and C are able to remove electron from the surface of metal. So, after the removal of electrons rest of the energy of photons is transferred to eject electrons and this energy is converted into kinetic energy.

As energy of B is greater than the energy of C and A has the lowest energy among all.

Therefore, order of energy from lowest to highest is as follows.

A < C < B

Now, the relation between energy and wavelength is as follows.

E = $\frac{hc}{\lambda}$

where, $\lambda$ = wavelength

So, energy is inversely proportional to wavelength. Therefore, increase in energy means decrease in wavelength.

Therefore, increasing order of wavelength is as follows.

B < C < A

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3 years ago