Mole Conversions

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 the same number of entities (atoms, molecules, ions, etc.) as there are in 12 grams of carbon-12.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass of a compound, sum the atomic masses of all the atoms in the molecular formula, using the periodic table for reference.

Front

What is Avogadro's number and why is it important?

Back

Avogadro's number, approximately 6.02 x 10^23, is the number of particles in one mole of a substance. It is important for converting between moles and number of particles.

Front

How do you convert moles to grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance (grams per mole).

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (grams per mole).

Front

What is the formula to find the number of molecules from grams?

Back

The formula is: Number of molecules = (mass in grams) x (1 mol/molar mass in grams) x (Avogadro's number).

Front

What is the significance of the conversion factor in mole calculations?

Back

Conversion factors are used to relate different units (e.g., grams to moles, moles to molecules) and are essential for solving stoichiometric problems.

Front

How many conversion steps are needed to go from molecules to grams?

Back

Two conversion steps are needed: first from molecules to moles, and then from moles to grams.

Front

What goes on the bottom of the conversion fraction when converting molecules to moles?

Back

Avogadro's number (6.02 x 10^23 molecules) goes on the bottom of the conversion fraction.

Front

What is the molar mass of SiCl4?

Back

The molar mass of SiCl4 is approximately 169.89 g/mol.