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The saline drip used in hospitals has 0.9 g of sodium chloride in every 100 mL of solution…

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The saline drip used in hospitals has $0.9\ \text{g}$ of sodium chloride in every $100\ \text{mL}$ of solution. What is its molarity? Sodium chloride is $58.5\ \text{g mol}^{-1}$ .

Need a reminder? The key ideaShow

Mass percent $= \dfrac{\text{mass of solute}}{\text{mass of solution}} \times 100$ . Mole fraction $x_A = \dfrac{n_A}{n_A + n_B}$ . Molarity $= \dfrac{\text{mol of solute}}{\text{L of solution}}$ . Molality $= \dfrac{\text{mol of solute}}{\text{kg of solvent}}$ , which does not change with temperature.

The worked solution

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The saline drip used in hospitals has 0.9 g of sodium chloride in every 100 mL of solution…

The worked solution

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