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lisabon 2012 [21]
2 years ago
13

How many moles of potassium are contained in 449 g of potassium? 23.9 moles 11.5 moles 2.14 moles 29.9 moles 14.5 moles

Chemistry
1 answer:
Darina [25.2K]2 years ago
3 0

There are<u> </u><u>11.5 moles</u> of potassium contained in 449 g fundamental units of potassium. therefore,

option B is correct.

A mole is the mass of a substance made up of the same number of fundamental components. Atoms in a 12-gram example are identical to 12C. Depending on the substance, the fundamental units may be molecules, atoms, or formula units.

Atomic weight 39.1 is assigned to potassium (chemical symbol K).

K content in a 449g sample is equal to

                                  =given weight / atomic weight

                                  =449/39.1

                                  = 11.5mol.

A 449g sample has 11.5 moles of potassium.

Learn more about fundamental units here-

brainly.com/question/13435862

#SPJ4

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Which quantity can be calculated using the equation E=MC^2
r-ruslan [8.4K]

Answer:

The energy needed to split an atom into separate protons, neutrons, and electrons

Explanation:

The equation E = MC^2 is developed by Einstein’s Special Relativity Theory

where,

E = Energy

M = mass

C = speed of the light

The energy should be measured in Joules i.e J

The mass should be measured in Kilogram i.e Kg

And, the speed of the light should be measured in meters per second i.e ms-1

The C should be squared

Now the energy is required to divided into three particles i.e protons, electrons and neutrons

It also needs to allocate the nucleus into distinct protons and neutrons that we called binding energy of nuclear

And if the energy is required to take off an electron from an atom we called the energy of ionization

And if the energy is required to add an electron to an atom so we called it affinity of electron

8 0
4 years ago
PLZ HELP ILL GIVE BRAINLIST!
Schach [20]

Answer:

The energy of a wave is inversely proportional to the wavelength of the wave.

As wavelength increases, the energy of the wave decreases.

As wavelength decreases, the energy of the wave increases.

Explanation:

The energy of a wave is directly proportional to the wave's frequency. As frequency increases, so does the energy of the wave.

E\propto f (energy E is proportional to frequency f)

<u>How is this related to wavelength?</u>

Frequency is inversely proportional to wavelength. That means that as frequency increases, wavelength decreases and as frequency decreases, wavelength increases.

f\propto \frac{1}{\lambda} (frequency f is inversely proportional to wavelength \lambda)

Therefore, as wavelength increases, the energy of a wave decreases and as wavelength decreases, the energy of a wave increases.

E\propto f\propto \frac{1}{\lambda}

6 0
3 years ago
How does gravity depend on the mass of the two objects?
Ket [755]

Answer:

A

Explanation:

Because the gravity and the mass of objects are proportionate

6 0
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prohojiy [21]

Answer:

The calorie is commonly used in the field of chemistry, and in many countries it is commonly used as a unit of food energy. There are two defined for the calorie, gram calorie (approximately equals 4.2 joules) and kilogram calorie (approximately equals 4.2 kilojoules).

Explanation:

6 0
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I NEED HELP PLEASE !!!!
babunello [35]
I think the answer is C
7 0
3 years ago
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