The term “proof,” still used to describe the ethanol content of alcoholic beverages, originated in 17th century England. A sample of whiskey was poured on gunpowder and set afire. If the gunpowder ignited after the whiskey had burned off, this “proved” that the whiskey had not been watered down. The minimum ethanol concentration for a positive test was about 50%, by volume. The 50% ethanol solution became known as “100 proof.” Thus, an 80-proof whiskey would be 40% C2H5OH by volume. Listed in the table are some data for several aqueous solutions of ethanol. With a minimum amount of calculation, determine which of the solutions are more than 100 proof. Assume that the density of pure ethanol is 0.79 g/mL. Molarity of ethanol (M) Density of solution (g/mL) 4.00 0.970 5.00 0.963 6.00 0.955 7.00 0.947 8.00 0.936 9.00 0.926 10.00 0.913
The term “proof,” still used to describe the ethanol content of alcoholic beverages, originated in 17th century England. A sample of whiskey was poured on gunpowder and set afire. If the gunpowder ignited after the whiskey had burned off, this “proved” that the whiskey had not been watered down. The minimum ethanol concentration for a positive test was about 50%, by volume. The 50% ethanol solution became known as “100 proof.” Thus, an 80-proof whiskey would be 40% C2H5OH by volume. Listed in the table are some data for several aqueous solutions of ethanol. With a minimum amount of calculation, determine which of the solutions are more than 100 proof. Assume that the density of pure ethanol is 0.79 g/mL.
Molarity of ethanol (M) Density of solution (g/mL)
4.00 0.970
5.00 0.963
6.00 0.955
7.00 0.947
8.00 0.936
9.00 0.926
10.00 0.913
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