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Calculate the molarity of each of the following solutions:(a) 293 $\mathrm{g} \mathrm{HCl}$ in 666 $\mathrm{mL}$ of solution, a concentrated HCl solution(b) 2.026 $\mathrm{g} \mathrm{FeCl}_{3}$ in 0.1250 $\mathrm{L}$ of a solution used as an unknown in general chemistry laboratories(c) 0.001 $\mathrm{mg} \mathrm{Cd}^{2+}$ in $0.100 \mathrm{L},$ the maximum permissible concentration of cadmium in drinking water(d) 0.0079 $\mathrm{g} \mathrm{C}_{7} \mathrm{H}_{5} \mathrm{SNO}_{3}$ in one ounce ( 29.6 $\mathrm{mL} )$ , the concentration of saccharin in a diet soft drink.

(a) 12.1 $\mathrm{M}$(b) 0.0999 $\mathrm{M}$(c) $8.9 \times 10^{-9} \mathrm{M}$(d) 0.001 $\mathrm{M}$

Chemistry 102

Chemistry 101

Chapter 3

Composition of Substances and Solutions

Solutions

Composition

Carleton College

University of Central Florida

Rice University

University of Kentucky

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to calculate molar ity. We need malls divided by leaders and so forgiven the mass of a substance. We can use that information to figure this out. So, for example, we have 293 g of each seal can convert that to moles. We take the Mueller Mass so to 93 divided by 36.461 And that gives us 8.4 moles. And if the volume is 0.666 leaders, then we just divide. Okay, we get 12.1 smaller if we have 2.2 six grounds of FCC l three. The mass of FCC L three is 1 62.20 6 g. That's equivalent toe. One more if e will divide those two numbers 2.26 divided by 1. 62 point 206 I get 0.1 two moles. Our volume is 0.1250 leaders. Then we just divide Okay, if we have 0.1 milligrams of cadmium two plus first step is to convert that 2 g so in ah 1000 mg you have 1 g and then cadmium is 112.41 g in one more. Then we'll divide and we get 8.9 times 10 to the negative 10 divided by 0.100 leaders on That's equal to 8.9 times 10 to the negative. Nine smaller. And then, if we have 0.79 g of C seven h five s, n 03 The mass of that is 1 83.187 g. It's equivalent toe one mole Well, divine 0.79 by the mouse. We get four point three times 10 to the negative. Fifth Mueller. I'm sorry, Moles. One more step. We divided by the volume 10.296 leaders getting ahead of myself and now got 0.0 one Mueller.

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