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Formula from Chapter 3: definition concentration as mass fraction in percent
\(\mathrm{fraction}_{\mathrm{bymass}} = \dfrac{m_{\mathrm{solute}}}{m_{\mathrm{solution}}} \cdot 100\ \mathrm{％}\)
\(m_{\mathrm{solute}}\)
\(= 0.741\ \mathrm{g}\)
\(m_{\mathrm{solution}}\)
\(= 100.\ \mathrm{g}\)
\(\mathrm{fraction}_{\mathrm{bymass}}\)
\(= \dfrac{m_{\mathrm{solute}}}{m_{\mathrm{solution}}} \cdot 100\ \mathrm{％}\)
\(\ \ \ =\dfrac{0.741\ \mathrm{g}}{100.\ \mathrm{g}} \cdot 100\ \mathrm{％}\)
\(\ \ \ =7.410\times 10^{-3} \cdot 100\ \mathrm{％}\)
\(\ \ \ =0.741\ \mathrm{％}\)