Chemistry: What is the molarity of a 27.0% (v/v) aqueous ethanol solution? the density of ethanol (c2h6o, molar mass 46.07 g/mol) is 0.790 g/ml?

What is the molarity of a 27.0% (v/v) aqueous - id270962330, AnwarWeirdLol1182

JakerGamer

13.03.2022

M=4.63M

Explanation:

Hello,

In this case, with the given by-volume percentage and considering the molarity as:

$M=\frac{n_{Ethanol}}{V_{solution}}$

We assume the solution having 100 mL of volume in total, thus, the volume of ethanol is 27.0 mL, therefore, the moles:

$n_{Ethanol}=27.0mL*\frac{0.790g}{1mL}*\frac{1mol}{46.07g}=0.463molEthanol$

Moreover, the volume of the solution in liters is:

$V_{solution}=100mL*\frac{1L}{1000mL} =0.1L$

Finally, the molarity is:

$M=\frac{0.463mol}{0.1L}\\ M=4.63M$

Best regards.

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