Calculate the molarities of solutions that contain the...

Calculate the molarities of solutions that contain the following masses of solute in the indicated volumes: (a) $27.8 \mathrm{~g}$ of $\mathrm{H}_{3} \mathrm{AsO}_{4}$ in $400 . \mathrm{mL}$ of solution; (b) $6.33 \mathrm{~g}$ of $(\mathrm{COOH})_{2}$ in $500 . \mathrm{mL}$ of solution; (c) $6.33 \mathrm{~g}$ of $(\mathrm{COOH})_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}$ in 500. mL of solution.

Calculate the molarities of solutions that contain the following masses of solute in the indicated volumes: (a) $27.8 \mathrm{~g}$ of $\mathrm{H}_{3} \mathrm{AsO}_{4}$ in $400 . \mathrm{mL}$ of solution; (b) $6.33 \mathrm{~g}$ of $(\mathrm{COOH})_{2}$
in $500 . \mathrm{mL}$ of solution; (c) $6.33 \mathrm{~g}$ of $(\mathrm{COOH})_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}$ in
500. mL of solution.

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Key Concepts

Unit Conversion

Unit conversion is a critical step in ensuring consistency in calculations, particularly when converting the volume of a solution from milliliters (mL) to liters (L), since the molarity formula requires the volume to be in liters.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is determined by summing the atomic masses of all the atoms in the compound's chemical formula, and it is essential for converting a given mass of solute to the corresponding number of moles.

Molarity

Molarity is a concentration unit that expresses the number of moles of a solute present in one liter of solution. It is calculated using the formula M = n/V, where 'n' is the number of moles of the substance and 'V' is the volume of the solution in liters.

Mole Concept

The mole is a fundamental unit in chemistry that represents a specific number of particles, 6.022×10^23, known as Avogadro's number. It is used to convert between the mass of a substance and the number of molecules or atoms present.

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