<p>The molecular formula of a commercial resin used for exchanging ions in water softening is&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>C</mi><mn>8</mn></msub><msub><mi>H</mi><mn>7</mn></msub><mi>S</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;Na (Mol. Wt. 206), What would be the maximum uptake of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>C</mi><msup><mi>a</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>&nbsp;ions by the resin when expressed in mole per gram resin?</p>