Author Question: The term "proof" is defined as twice the percent by volume of pure ethanol in solution. Thus, a ... (Read 99 times)

dmcintosh · **on:** Mar 21, 2021

Question 1

The solubility of O₂ in water is 0.590 g/L at an oxygen pressure of around 15.5 atm. What is the Henry's law constant for O₂ (in units of mol/L·atm)?

◦ 3.81 × 10^–2
◦ 1.19 × 10^–3
◦ 8.41 × 10²
◦ 2.86 × 10^–1
◦ None of these are within 5% of the correct answer.

Question 2

The term "proof" is defined as twice the percent by volume of pure ethanol in solution. Thus, a solution that is 95% (by volume) ethanol is 190 proof. What is the molarity of ethanol in a 92 proof ethanol/water solution?

	density of ethanol	= 0.80 g/cm³
	density of water	= 1.0 g/cm³
	mol. wt. of ethanol	= 46 g/mol

◦ 0.46 M
◦ 0.80 M
◦ 0.92 M
◦ 8.0 M
◦ 17 M

Laurenleakan · **Reply #1 on:** Mar 21, 2021

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