Calculate the mass, in grams, for each of the following: d. 0.145 mole of C₂H₆O

The mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole contains approximately 6.022 x 10²³ entities, such as atoms or molecules. This concept allows chemists to convert between the number of particles and the mass of a substance, facilitating calculations in stoichiometry.

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule. For example, the molar mass of ethanol (C₂H₆O) can be determined by adding the atomic masses of carbon, hydrogen, and oxygen, which is essential for converting moles to grams.

To convert moles of a substance to grams, the formula used is: mass (g) = moles × molar mass (g/mol). This calculation is crucial in chemistry for determining how much of a substance is needed or produced in a reaction. Understanding this conversion is key to solving problems involving quantities of reactants and products.