Answered: A solution is made using 130.0 mL of…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter13: The Chemistry Of Solutes And Solutions

Section: Chapter Questions

Problem 56QRT: A 12-oz (355-mL) Pepsi contains 38.9 mg caffeine (molar mass = 194.2 g/mol). Assume that the...

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A solution is made using 130.0 mL of acetonitrile (density 0.7766 g/mL) and 250.0 mL of water (density 1.000 g/mL). What is the molality acetonitrile in water?

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$d e n s i t y o f a c e t o n i t r i l e = 0.7766 g / m l d e n s i t y = \frac{m a s s o f a c e t o n i t r i l e}{v o l . o f a c e t o n i t r i l e} = \frac{m a s s (g)}{130 m l} 0.7766 g / m l = \frac{m a s s}{130} m a s s o f a c e t o n i t r i l e = 0.7766 \times 130 = 100.95 g d e n s i t y o f w a t e r = 1 g / m l m a s s o f w a t e r = d e n s i t y \times v o l . o f w a t e r = 1 \times 250 = 250 g = 0.250 k g$

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