Which of the following best describes a mole as used in chemistry?

Chemistry

1 answer:

bazaltina [42]3 years ago

8 0

Answer: a very large number of objects

Explanation: Mole is the amount of objects and it has the usually Avogadro number of atoms, molecules, ions, etc in chemistry

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What is the fraction of the hydrogen atom's mass (11h) that is in the nucleus? the mass of proton is 1.007276 u, and the mass of

ololo11 [35]

Hello there!

To determine the fraction of the hydrogen atom's mass that is in the nucleus, we have to keep in mind that a Hydrogen atom has 1 proton and 1 electron. Protons are in the nucleus while electrons are in electron shells surrounding the nucleus. The mass of the nucleus will be equal to the mass of 1 proton and we can express the fraction as follows:

$Mass Fraction= \frac{mass 1 Proton}{mass H atom} = \frac{1,007276 u}{1,007825}=0,9995$

So, the fraction of the hydrogen atom's mass that is in the nucleus is 0,9995. That means that almost all the mass of this atom is at the nucleus.

Have a nice day!

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Which of the following represents the velocity of a light wave?

Softa [21]

Answer:

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c = fλ

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• "f" is the frequency of the electromagnetic waves,

• " λ" is its wavelength.

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Determine the molarity for each of these solutions. Then lost the solutions in order of increasing molarity.

Vaselesa [24]

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