Determining moles involves dividing the mass of a substance by its molar mass. This fundamental formula, moles = mass / molar mass, is crucial in stoichiometry and various chemistry calculations.
To determine the number of moles in a substance, you can use the formula:
moles = mass / molar mass
First, measure the mass of the substance in grams. Then, identify the molar mass of the substance, which represents the mass of one mole of the substance in grams per mole. You can find the molar mass by adding up the atomic masses of all the atoms in a molecule.
For example, if you have 30 grams of a substance with a molar mass of 60 g/mol, the calculation would be:
moles = 30 g / 60 g/mol = 0.5 mol
This means you have 0.5 moles of the substance. Remember to use consistent units and check the periodic table for atomic masses when calculating molar masses. This method is fundamental in stoichiometry and helps in various chemistry calculations involving the quantity of substances.
Complete question:
How to determine the number of moles in a substance?