How many moles are present in 0.250 g of each of these compounds? (a) C7 H5 NO3 S, saccharin,

step 1 So here we're looking to determine the molecular mass and then using the value of the weight as

How many moles are present in 0.250 g of each of these...

How many moles are present in $0.250 \mathrm{~g}$ of each of these compounds? (a) $\mathrm{C}_{7} \mathrm{H}_{5} \mathrm{NO}_{3} \mathrm{~S}$, saccharin, an artificial sweetener (b) $\mathrm{C}_{13} \mathrm{H}_{20} \mathrm{~N}_{2} \mathrm{O}_{2}$, procaine, a painkiller used by dentists (c) $\mathrm{C}_{20} \mathrm{H}_{14} \mathrm{O}_{4}$, phenolphthalein, a dye

How many moles are present in $0.250 \mathrm{~g}$ of each of these compounds?
(a) $\mathrm{C}_{7} \mathrm{H}_{5} \mathrm{NO}_{3} \mathrm{~S}$, saccharin, an artificial sweetener
(b) $\mathrm{C}_{13} \mathrm{H}_{20} \mathrm{~N}_{2} \mathrm{O}_{2}$, procaine, a painkiller used by dentists
(c) $\mathrm{C}_{20} \mathrm{H}_{14} \mathrm{O}_{4}$, phenolphthalein, a dye

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Key Concepts

Molar Mass

Molar mass is the mass in grams of one mole of a substance. It is calculated by summing the atomic masses of all atoms in a molecule as indicated by its chemical formula. This conversion factor, expressed in grams per mole, is crucial for converting between the mass of a sample and the number of moles present.

Mass-to-Mole Conversions

Mass-to-mole conversion is a stoichiometric calculation where the number of moles in a given sample is determined by dividing the mass of the sample by its molar mass. This concept is essential in chemistry for quantifying substances in reactions, allowing for the comparison and combination of reactants on a molecular level.

Mole Concept

The mole is a fundamental unit in chemistry that represents a specific number of particles, typically atoms or molecules, equal to Avogadro's number (approximately 6.022 × 10^23). It provides a bridge between the atomic scale and the macroscopic scale, allowing chemists to count particles by weighing them and to connect mass measurements with the number of entities involved in a reaction.

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