What would you need to do to calculate the molality of 10 g of NaCl in 2 kg of water?A.Convert the 2 kg of water to moles of water.B.Convert the 2 kg of water to liters of water.C.Convert the 10 g of NaCl to kg of NaCl.D.Convert the 10 g of NaCl to moles of NaCl.
Question
What would you need to do to calculate the molality of 10 g of NaCl in 2 kg of water?A.Convert the 2 kg of water to moles of water.B.Convert the 2 kg of water to liters of water.C.Convert the 10 g of NaCl to kg of NaCl.D.Convert the 10 g of NaCl to moles of NaCl.
Solution
To calculate the molality of a solution, you need to know the amount of solute in moles and the amount of solvent in kilograms. Here are the steps you would need to follow:
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Convert the mass of NaCl from grams to moles. The molar mass of NaCl is approximately 58.44 g/mol. So, divide 10 g by 58.44 g/mol to get the number of moles of NaCl.
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The mass of water is already given in kilograms, so no conversion is necessary.
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Finally, calculate the molality by dividing the number of moles of NaCl by the mass of water in kilograms. The formula for molality (m) is m = moles of solute / kg of solvent.
So, the correct steps are C and D.
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