Acough syrup contains 5.0 % ethyl alcohol c2h5oh by mass. if the density of the solution is 0.9928 g/ml. determine the molarity of the alcohol in the cough syrup.
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Ответ:
The molarity of ethyl alcohol in cough syrup is 1.08 M
Explanation:
We are given:
(m/m) of ethyl alcohol = 5.0 %
This means that 5 g of ethyl alcohol is present in 100 g of solution.
To calculate volume of solution, we use the equation:
Density of solution = 0.9928 g/mL
Mass of solution = 100 g
Putting values in above equation, we get:
To calculate the molarity of solution, we use the equation:
We are given:
Mass of solute (ethyl alcohol) = 5 g
Molar mass of ethyl alcohol = 46.07 g/mol
Volume of solution = 100.725 mL
Putting values in above equation, we get:
Hence, the molarity of ethyl alcohol in cough syrup is 1.08 M
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