 Okay, one more time. We'll try this. Calculate the specific rotation of valine at 20 degrees Celsius. If you have a mass of 0.497 grams of the substance dissolved into 5.00 mL of ethanol, and the sample is placed into a 2.00 decimator polarimeter tube. If the observed rotation is plus 6.58 degrees, calculate the specific rotation. So, what's the first thing we need to do here? Just remember the formula, right? Okay, so can you do it? Yes. So, what is it? Specific. Specific. Equals? Observe. Observe divided by? Pathing. Pathing. Pathing. Pathing. Pathing. Pathing. We've got to observe, but we don't have concentration, right? So, we've got to figure that out first. So, concentration is going to equal, well, the mass, 0.497 grams divided by 5.00 mL. It's going to be something like that. I'll bet you that's the right answer. 4 grams per mL. And remember, we want concentration values of grams per mL. We want pass lengths of decedent meters. So, we've got that. And we've got our observe. So, we should just be able to plug in chug now, right? Yeah. Okay, wonderful. Okay, so, plus 6.58 degrees of 994. And this is going to go to three significant figures. Remember to put the plus there. 33.1 degrees Celsius. So, this is going to be the specific rotation of, what was the space length, right? Any questions on this one? No questions. That's wonderful. Good. You have a question on it? Okay, did you get that answer? Then you probably did it incorrect, okay? So, we'll kill the video and we'll look at what you did. Okay? Any other questions? Okay.