The mass of one mole of a substance is equal to that substance’s molecular weight. For example, the mean molecular weight of water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams. Key Terms. mole: The amount of substance of a system that contains as many elementary entities as there are atoms in 12 g of carbon-12.
Molar mass can be measured by a number of experimental methods, many of which will be introduced in later chapters of this text. Molecular formulas are derived by comparing the compound’s molecular or molar mass to its empirical formula mass. As the name suggests, an empirical formula mass is the sum of the average atomic masses of all the
Estimate the molar concentration of CH₄, which is: 0.5 mol / 1.5 L = 0.3333 M. Multiply it by the methane molar mass (16 g/mol). Multiply everything by 1000 mg/g. As a result, we obtain: 0.3333 M × 16 g/mol × 1000 mg/g = 5,333 ppm
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is molecular weight and molar mass the same
