Moles Flashcard 1

Front

What is a mole?

Back

A mole is a unit of measurement in chemistry that represents 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

What is percent composition?

Back

Percent composition is the percentage by mass of each element in a compound.

Front

How do you calculate percent composition?

Back

Percent composition = (mass of element in 1 mole of compound / molar mass of compound) x 100%.

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 grams are in 1 mole of glucose (C6H12O6)?

Back

1 mole of glucose weighs 180 grams.

Front

How do you convert grams to moles?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water is approximately 18 g/mol.

Front

How many moles are in 4.5 x 10^24 particles?

Back

7.47 moles.

Front

What is the formula for calculating the number of particles from moles?

Back

Number of particles = moles x Avogadro's number.

Front

What is the percent composition of N2S2?

Back

N: 30.4%, S: 69.6%.