Mole & Conversions Flashcard PREVIEW

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

Front

How do you calculate the number of moles from grams?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of diphosphorus pentoxide (P2O5)?

Back

The molar mass of diphosphorus pentoxide (P2O5) is 141.94 g/mol.

Front

How many moles are in 86.24 g of diphosphorus pentoxide (P2O5)?

Back

0.61 moles.

Front

How do you calculate the number of atoms in a sample?

Back

Number of atoms = (number of moles) x (Avogadro's number, 6.022 x 10^23 atoms/mol).

Front

How many atoms are in 456 g of carbon dioxide (CO2)?

Back

1.871 x 10^25 atoms.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of particles in one mole of a substance.

Front

How many atoms are in 454 grams of iron (Fe)?

Back

4.90 x 10^24 atoms.

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How many atoms of carbon are in 6.00 g of carbon?

Back

3.01 x 10^23 atoms C.

Front

How do you convert molecules to grams?

Back

Convert molecules to moles using Avogadro's number, then multiply by the molar mass.