Question

How do you convert between the mass and the number of moles of a substance?

Answer 1

To convert between the mass and moles of a substance, use the molar mass as a conversion factor. For mass to moles, divide the mass by the molar mass; for moles to mass, multiply the number of moles by the molar mass. In reactions, mole ratios from the balanced equation are also used for mass-to-mass conversions.

Step-by-step explanation:

To convert between the mass and the number of moles of a substance, one must use the molar mass of the substance, which can be found in the periodic table. Here is a step-by-step explanation:

1. Determine the molar mass of the substance. The molar mass is numerically equal to the atomic or molecular mass in grams per mole.
2. To convert mass to moles, divide the mass of the substance by its molar mass.
3. To convert moles to mass, multiply the number of moles by the molar mass.
4. In chemical reactions, use the mole ratio from the balanced chemical equation to convert moles of one substance to moles of another.
5. Finally, convert the moles of the second substance to mass, if required, by multiplying by its molar mass.

It is important to remember that this process allows you to perform mass-to-mass conversions in stoichiometry problems, where you start with a known mass of one substance and use the equation's mole ratio to find the corresponding mass of another substance involved in the reaction.

Answer 2

To convert from grams to moles, you divide the number of grams by the molar mass To convert from moles to grams, you multiply by the molar mass. You must first calculate the molar mass of the substance