Asked Jan 24, 2020

A 20.0% aqueous solution by mass of urea (CH4N2O) has a density of 1.055g/mL. What is the molality of urea in this solution? What is the molarity of the same solution


Expert Answer

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Step 1

Given information:

  • 20% aqueous solution by mass of urea
  • Density of solution is 1.055 g/mL
Step 2

20% aqueous solution by mass of urea, that means a solution contains 20 g of urea and 100 g of water.

The mass of urea is 60.07 g/mol. The mole of urea is calculated as follows:

Chemistry homework question answer, step 2, image 1
Step 3

The molality is calcula...

Chemistry homework question answer, step 3, image 1

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