What is the mass of each sample? a. 15.7 mol HNO3 b. 1.04 × 10^-3 mol H2O2 c. 72.1 mmol SO2 d. 1.23 mol xenon difluoride

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Key Concepts

Molar Mass

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 the atoms in a molecule. For example, the molar mass of HNO3 is approximately 63.01 g/mol, which is essential for converting moles to grams.

Conversion Between Moles and Mass

To find the mass of a substance from its amount in moles, the formula used is: mass (g) = moles × molar mass (g/mol). This relationship allows chemists to convert between the number of moles of a substance and its corresponding mass, facilitating calculations in stoichiometry and chemical reactions.

Unit Conversions

Unit conversions are necessary when dealing with different units of measurement, such as converting millimoles (mmol) to moles (mol). Since 1 mmol is equal to 0.001 mol, understanding these conversions is crucial for accurately calculating the mass of substances in various units, ensuring consistency in chemical calculations.