Percent by mass to molarity. Convert 4.45% NaOH (aq) solution to molarity. The s

Question

Percent by mass to molarity. Convert 4.45% NaOH(aq) solution to molarity. The solution density is 1.047 g/mL. Answer to 3 significant figures with appropriate units.

Percent by mass to parts per million. Convert 4.45% NaOH(aq) solution to parts per million NaOH in the solution. Do NOT assume a dilute aqueous solution! Use the molar mass of the entire salt formula, not either ion alone. The solution density is 1.047 g/mL. Answer to 3 significant figures with appropriate units.

Mole fraction to molality. Convert 0.1538 mole fraction of propanol (C3H8O) in water to molality. (Hint: begin by assuming 1 mole total and determine the contributing moles of propanol and contributing moles of water.) Answer to 4 significant figures with appropriate units.

Explanation / Answer

Post multiple questions to get the remaining answers. Thanks

1) Solution Density = 1.047 gm/ml

1 L of solution will weigh 1000 * 1.047 = 1047 gms

Mass Percent of NaOH solution = 4.45% = 4.45/100 * 1047 = 46.5915 gms

Molar mass of NaOH = 23 + 16 + 1 = 40 gm/mol

Molarity = moles of solute/per L of solution

=> 46.5915/40 M

=> 1.16M (answer uptil 3 significant figures)

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