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Calculate the molar mass of each of the following compounds:(a) hydrogen fluoride, HF(b) ammonia, $\mathrm{NH}_{3}$(c) nitric acid, HNO_ $_{3}$(d) silver sulfate, $\mathrm{Ag}_{2} \mathrm{SO}_{4}$(e) boric acid, $\mathrm{B}(\mathrm{OH})_{3}$

a) 20.006 $\mathrm{g} \mathrm{mol}^{-1}$b) 17.031 $\mathrm{g} \mathrm{mol}^{-1}$c) 68.003 $\mathrm{g} \mathrm{mol}^{-1}$d) 311.797 $\mathrm{g} \mathrm{mol}^{-1}$e) 61.832 $\mathrm{g} \mathrm{mol}^{-1}$

Chemistry 102

Chemistry 101

Chapter 3

Composition of Substances and Solutions

Solutions

Composition

Carleton College

Drexel University

University of Kentucky

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okay, We're gonna be calculating the more mass for five different compounds. And one thing I wanted to make sure everybody understood is that when you're calculating more mass, you're simply looking at the atomic masses for the elements on the periodic table. And for this exercise, I will be rounding to the hundreds. Place your instructor, maybe asking you to round differently. But I will be rounding to the hundreds place so letter A has hydrogen fluoride. So what we'll do is we'll inventory what we have for Adam's. So we have 100 in and we have flooring. Okay, so now what we do is we look att what? Their masses are on the periodic table. And for hydrogen, it's 1.1 grams per mole. And for flooring, it is 19 grams for more. We're gonna add those two together. That's just addition and you come up with 20 point 01 crams for more. That is your final answer. Okay, Now it's looking ammonia, which notice has nitrogen. But it also has this subscript of three that's on the hydrogen. So we're gonna have to pay attention to that. So let's take care of the nitrogen first, and I'm gonna say that there is just one of them and you'll see why in a second. So I'm gonna say one, and there's one of them, and I'm gonna multiply it. That one nitrogen by its atomic mass, which is the same as the more mass. And we find that nitrogen is 14.1 grams formal. And so if we multiply that 14.1 times, one comes out to 14.1 Now the hydrogen, there's three of them because of that sub script. So we're gonna multiply the three by the atomic mass or more mass of hydrogen, and that comes out to 3.3 And these air grams formal okay, were Add them together, total it up, and we get a more mass of 17 0.0 for grams promote. Okay, Now on the letter C. The nitric acid notice. We have three elements. We have hydrogen, and again, I'm gonna inventory. We have one of them. We have nitrogen. There's one the oxygen's. There's three. Okay, so we're gonna do one timesthe. 1.1 nitrogen, as we found earlier, is 14.1 and the oxygen is 16. 16 times three is 48. Oh, and remember these air all grams per mole and add them all together plus plus plus. And you come up with a more mass of 63 bullion. 02 grams formal. Okay, Letter D, that is silver sulfate again. We have three different elements. We have silver and there's two of them. We have sulphur, just one of those, and the oxygen knows there's a four sub script. Okay, so two silvers and the more mass silver it's heavier. One, it's 107.87 multiplied together. That's 2 15 0.74 sulfur is 32.6 So that is 32.6 and my oxygen is 16. That's gonna be equal to 64. These are all grams promote. Remember, we're gonna add them together, and we come up with a total of 3 11 0.8 zero grams per mole. Okay. And then finally, we have letter E, which is the boric acid. And, um, this one. You need to be careful because, yes, there are three elements. Okay, but notice that I'm writing all over the place here notice that there's a three on this hydroxide ion here. Okay, so you gotta pay attention to that because that means that they're three hydrogen tze and three oxygen's. Okay, Okay, so we'll start with the boron and there's one of them hydrogen. As I just talked about with that sub script, there's three in the oxygen. There's three. Okay. Boron has a muller mass. Uh, 10.81 Hydrogen is one point 01 and oxygen is 16. So we have 10.81 3.3 and 48 adding them all together. And remember, it's grams per mole and we get a molar mass of 61 0.84 grams her mole, and that is how you saw for more mess.

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