Respuesta :
4.21×[tex]10^{-4}[/tex] Molal is the molality, m, of a solution made by adding 8.21 g of solid naphthalene, [tex]C_{10}H_8[/tex], to 27.92 g of liquid benzene,[tex]C_6H_6[/tex].
What are moles?
A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
[tex]Molality = \frac{Moles \;solute}{Solvent \;in \;kg}[/tex]
Moles of naphthalene=[tex]\frac{mass}{molar \;mass}[/tex]
Moles of naphthalene[tex]=\frac{8.21 g}{128.2 g/mol}[/tex]
=0.064
Moles of benzene[tex]=\frac{mass}{molar \;mass}[/tex]
Moles of benzene[tex]=\frac{27.92 g}{78.1 g/mol}[/tex]
=0.357
Total mole of solute= 0.064+0.357=0.421
[tex]Molality = \frac{Moles \;solute}{Solvent \;in \;kg}[/tex]
[tex]Molality = \frac{0.421 }{1000}[/tex]
Molality = 4.21×[tex]10^{-4}[/tex] Molal
Hence, 4.21×[tex]10^{-4}[/tex] Molal is the molality, m, of a solution made by adding 8.21 g of solid naphthalene, [tex]C_{10}H_8[/tex], to 27.92 g of liquid benzene, [tex]C_6H_6[/tex].
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