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Video instructions and help with filling out and completing Who 8850 Form Solutions

Instructions and Help about Who 8850 Form Solutions

Calculate the molarity of a solution prepared by dissolving 9.8 moles of solid NaOH (sodium hydroxide) in enough water to make 3.62 liters of solution. To calculate molarity, we divide the moles of solute by the liters of solution. So, molarity = moles of solute / liters of solution. In this case, the solute is sodium hydroxide, and we have 9.8 moles of it. The liters of solution is 3.62. Therefore, molarity = 9.8 moles / 3.62 liters. Rounding the answer to two significant figures, since we have 9.8 moles, we get 2.7 M. "M" represents molarity, which means there are 2.7 moles of NaOH solute for every one liter of the solution. In another example, we dissolve 152.5 grams of CuCl2 (copper chloride) in water to make a solution with a final volume of 2.25 liters. We need to find the molarity. To do this, we need to convert the grams of copper chloride into moles so we can use it in the molarity equation. The molar mass of copper chloride can be calculated by adding the atomic masses of copper and chlorine. Copper has a molar mass of 63.55, and there are two chlorines with a molar mass of 35.44 each. Thus, the molar mass of copper chloride is 134.45 grams per mole. Using this conversion factor, we can convert the 152.5 grams of copper chloride into moles. Multiplying 152.5 grams by 1 mole/134.45 grams, we get 1.134 moles of CuCl2. Now, we can calculate the molarity. Molarity = moles of solute / liters of solution. We have 1.134 moles of CuCl2 and 2.25 liters of solution. Computing this, we get a molarity of 0.504 M. This means there are 0.504 moles of CuCl2 for every one liter of the solution. In the last example, we have a solution...