part a part b part c part d Model Other Measurements of Solutes in Solutions Alt

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part b

part c

part d

Model Other Measurements of Solutes in Solutions Although there are many other units used to measure the amount of a solute in a solution, two of those that are frequently used in chemistry include mole fracton(X) and weight percent. These two units are easy to use and calculate. Mole fraction was previously introduced for gases but can be used for solutions of liquids and solids as well Mole Fraction, X Weight Percent moles of solute/total number of moles in mass of solute/total mass of solution x solution 100 For a solution prepared from 100 mL of water and 4.44 g of NaCl determine the mole fraction of NaCl (assume the density of water is 1.00 g/mL) Enter the numerical answer in decimal notation, do not include the units

Explanation / Answer

part a:

To calculate mole fraction of NaCl:-

Formula for mole fraction of NaCl is as follows:

mole fraction=no.of moles of solute/total no.of moles in solution -------eqn no.1

1) moles of NaCl=given weight/molecular weight

=4.4/58.44=0.0752 moles

2) moles of H2O=100/18.02=5.5493 moles

So ,total no.of moles in solution=no.of moles of NaCl+no.of moles of H2O

=0.0752+5.5493=5.6245 moles

using these values in equation no 1 as follows:

mole fraction of NaCl=0.0752/5.6245

=0.0133

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