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Consider this question: What is the mass of solute in 200.0 $\mathrm{L}$ of a $1.556-M$ solution of KBr?(a) Outline the steps necessary to answer the question.(b) Answer the question.

(a) $\bullet$ Find the number of moles of solute by multiplying the molarity to the voli$\bullet$ Find the molar mass of glucose.$\bullet$ Find the mass of solute by multiplying the number of moles by the molar(b) 37030 $\mathrm{g}$

Chemistry 102

Chemistry 101

Chapter 3

Composition of Substances and Solutions

Solutions

Composition

Carleton College

University of Central Florida

Brown University

University of Toronto

Lectures

03:07

A liquid is a nearly incom…

04:38

A liquid is a state of mat…

03:06

What mass of solute is pre…

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How many grams of solute a…

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For each of the following …

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So I have a solution of potassium bromide, K p r. I'm given the volume which is 200 litres of the solution and I'm given the concentration which is 1.556 mourner on DDE Just to make my life easier. One mourner is equivalent to one more per liter and then I'm required to find the math, usually in grounds using the information I have. So in order to tackle this problem, I'm gonna use to common equations and stock metric chemistry. The 1st 1 is that the concentration of any solution is equal to the number of malls over the volume on the second equation is that the massive for compound is equal to the number of morals times the medical reet Rearranging the first equation, I get that the number of malls is equal to the concentration turns the volume and then I would calculate the molecular weight from the periodic table. We substitute in the number of Moore's into this equation in order to get our desired mess. So let's start So first of all, as we said, the number of malls, it is the concentration terms volume, which in my case, is gonna be 1.556 I'm gonna include the units to make sure they cancel out. Doing it for concentration is more Perdita on The volume was given in terms of fleeter. As you could see it, the leaders cancel out on what I would get is 300 on 11.2 moles. All right now we have the number of months. The second step is to calculate the molecular weight off potassium bromide. The moniker rate is the sum of the atomic mass number off my constituent elements in my compound. In this case, I have one atom of potassium or one iron of potassium, and I have one iron of bromide looking at the periodic table. The atomic mass number, signified by a R for potassium is 39.1 on the unit is extremes on the atomic mass number off bromide. This 79.9 extremes now, depending on the periodic table you use, these numbers might be just very slightly different. For instance, you might find the atomic mass number of protesting to be 39 or for bromide to be 80. The in my case, the predictable I used which is the most abundant form would basically take the average atomic mass lumber, which from its name is the average across the different isotopes existing in nature. Some periodic tables prefer taking the most naturally abundant isotope. In either case, Dancer will not defend by months. It's just something to bear in mind. And so the medically weight would be simply the addition of these two atomic mass numbers, which has got to give me 119 the unit for the military wheat. There's Graham Vimal. We go to our final stand, which is to calculate the mass using the second decrees. So we've calculated the number of malls, which is 311.2 from Step one. And I'm gonna put my unit on recalculated the molecular way to be 119 grams Permal and I'm also gonna include you know, to be true. They cancel out, as you could see the Morse cancel out on DDE. What I would get for my final answer of the mass is 37,000 on 33 grounds. The number you would get good range between 37,000 and 30 grand's and 37 7 37,000 and 35 grams, depending on which number is used for your atomic mass. And there we go. This is your mess.

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