Calculate the mass percent of the following solutions: (a) 25.0 g NaNO3 in 125.0 g H2 O (b) 1.

step 1 In this question, we need to calculate the mass, mass percentage concentration of various soluti

Calculate the mass percent of the following solutions: (a)...

Calculate the mass percent of the following solutions: (a) $25.0 \mathrm{~g} \mathrm{NaNO}_{3}$ in $125.0 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}$ (b) $1.25 \mathrm{~g} \mathrm{CaCl}_{2}$ in $35.0 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}$ (c) $0.75 \mathrm{~mol} \mathrm{~K} \mathrm{KrO}_{4}$ in $225 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}$ (d) $1.20 \mathrm{~mol} \mathrm{H}_{2} \mathrm{SO}_{4}$ in $72.5 \mathrm{~mol} \mathrm{H}_{2} \mathrm{O}$

Calculate the mass percent of the following solutions:
(a) $25.0 \mathrm{~g} \mathrm{NaNO}_{3}$ in $125.0 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}$
(b) $1.25 \mathrm{~g} \mathrm{CaCl}_{2}$ in $35.0 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}$
(c) $0.75 \mathrm{~mol} \mathrm{~K} \mathrm{KrO}_{4}$ in $225 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}$
(d) $1.20 \mathrm{~mol} \mathrm{H}_{2} \mathrm{SO}_{4}$ in $72.5 \mathrm{~mol} \mathrm{H}_{2} \mathrm{O}$

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Key Concepts

Mass Percent

Mass percent is a measure of concentration defined as the mass of the solute divided by the total mass of the solution, multiplied by 100. It quantifies the portion of the solute relative to the overall mass of a solution and is especially useful in expressing solution compositions in a straightforward, weight-based manner.

Solute and Solvent

In any solution, the solute is the substance that is dissolved, while the solvent is the substance in which the solute is dissolved. Recognizing the roles of the solute and solvent is essential for calculating solution properties such as concentration, where the mass of each component contributes to the overall mixture.

Moles and Molar Mass

Moles quantify the amount of a substance, and the molar mass is the mass per mole of that substance. These concepts are crucial in converting between moles and grams, enabling accurate determination of a substance's mass when given a mole-based quantity, which is often necessary when preparing solutions.

Unit Conversions

Accurate unit conversion is fundamental in chemical calculations to ensure consistency and correctness. Whether converting from moles to grams using molar mass or summing masses of solution components, correct handling of units is vital for achieving the right concentration values.

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