Molar Mass and Percent Composition

Front

What is the definition of Molar Mass?

Back

Molar Mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of representative particles (atoms, molecules, etc.) in one mole of a substance.

Front

How do you calculate the number of moles from volume and molarity?

Back

Number of moles = Molarity (M) x Volume (L).

Front

What is the formula for percent composition by mass?

Back

Percent Composition = (Mass of element in 1 mole of compound / Molar Mass of compound) x 100%.

Front

How many particles are in 1 mole of any substance?

Back

1 mole of any substance contains 6.02 x 10^23 particles.

Front

What is the percent by mass of an element in a compound?

Back

It is the mass of the element divided by the total mass of the compound, multiplied by 100.

Front

If you have 2 moles of a substance, how many grams do you have if the molar mass is 18 g/mol?

Back

You have 36 grams (2 moles x 18 g/mol).

Front

What is the relationship between molarity, moles, and volume?

Back

Molarity (M) = Moles of solute / Volume of solution in liters.

Front

How do you find the new concentration after dilution?

Back

C1V1 = C2V2, where C is concentration and V is volume.

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water is approximately 18 g/mol (2 g/mol for H and 16 g/mol for O).