# Calculate the molality of an aqueous solution that is 9.70% NH3 by mass. The density of the...

## Question:

Calculate the molality of an aqueous solution that is 9.70% {eq}NH_3 {/eq} by mass. The density of the solution is 0.9651 g/mL.

## Unit Conversion:

In most unit conversions, the method used is dimensional analysis, which requires you to have an overview of how the calculation will flow depending on the final units. As an example, in order to convert the number of moles to mass, what you need to do is to multiply the number of moles of the chemical species by its molar mass to cancel the unit moles.

## Answer and Explanation: 1

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- Molality is expressed as the number of moles of the solute per kilogram of the solution
- Percent by mass can be expressed as the mass of the solute...

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Chapter 1 / Lesson 2Dimensional analysis is used in converting different units of measure through the multiplication of a given proportion or conversion factor. Learn how to solve single-step and multi-step problems using dimensional analysis and understand the cancellation of units in a numerator and denominator.