So we are given alcohol, and we know that our alcohol at 20 degrees Celsius has a vapor pressure of 40 mercury. And at 61 degrees Celsius, it has a vapor pressure of 360 millimeters of mercury. And our goal is to find a change in entropy of vaporization of 1 mol of alcohol. So to find that, we have to use something called a class here to clay for an equation. Now, if you want to learn more about this equation, where it comes from, and why it's important, check out the link below. So let's look at our equation.