Physics - Moles

Created: November 08, 2021

Flashcards

What does Avagadro’s constant represent?

The number of atoms in $12$ grams of Carbon-12.

What is one mole of a substance?

An amount in which the number of atoms/molecules is equal to Avogadro’s constant.

What is the molar mass of a substance?

The mass per mole of a substance.

How do you find the mass of one atoms from its mass number/nucleon number?

Divide the mass number by Avogadro’s constant.

What is a nucleon?

A proton or a neutron.

What is the mass number?

The number of protons or neutrons in the atom.

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\[^{35} _ {17} Cl\]

Which number is the mass/nucleon number?/

\[35\]

How can you calculate the number of particles from the number of moles of a substance?
\[\text{number of moles} \times \text{Avagadro's constant}\]

What is the molecular mass of a substance?

The mass of one molecule/atom of that substance.

What is the value of Avogadro’s constant?
\[6.02 \times 10^{23}\]

How many atoms are there in one mole of $^{12}C$?
\[6.02 \times 10^{23}\]

How many atoms are there in one mole of $^{35}Cl$?
\[6.02 \times 10^{23}\]

How many grams are there in one mole of $^{12}C$?
\[12g\]

How many grams are there in one mole of $^{35}C$?
\[35g\]

What is $N$ (the number of atoms/molecules) in terms of $n$ (the number of moles) and $N _ a$ (Avogadro’s constant)?
\[N = n \times N_A\]

What is $m$ (the mass of a substance) in terms of $n$ (the number of moles) and $M$ (the molar mass)?
\[m = n \times M\]


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