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Calculate the following to four significant figures:(a) the percent composition of ammonia, $\mathrm{NH}_{3}$(b) the percent composition of photographic fixer solution ( "hypo"), Na_{2} \mathrm { S } _ { 2 } \mathrm { O } _ { 3 }(c) the percent of calcium ion in $\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}$

(a) $\quad \% \mathrm{N}=82.24 \%$$\quad \% \mathrm{H}=17.76 \%$$\begin{array}{ll}{\text { (b) }} & {\% \mathrm{Na}=29.08 \%} \\ {} & {\% \mathrm{S}=40.56 \%} \\ {} & {\% \mathrm{O}=30.36 \%}\end{array}$(c) $\quad \% \mathrm{Ca}^{2+}=38.76 \%$

Chemistry 102

Chemistry 101

Chapter 3

Composition of Substances and Solutions

Solutions

Composition

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in this question. We've been after couplet to force technical figures, the percent composition of the subsidiary ants in the various compose and have been presented, so the 1st 1 is the percent composition of ammonia. So what this question is asking us to do is to calculate the percentage of nitrogen and hydrogen in ammonia. You know, this is probably the percent composition off the respective elements in this compound. We need to just take the molar mass off the respective elements and divided by the total molar mass of the sample. And what's by that by 100. So the percent off nitrogen and ammonia is essentially going to be the mole amounts of nitrogen just 14.7 grasp the mall divided by the mullahs. Mass off a simple of ammonia, which one calculated should yield 17.0 31 graspable times 100%. After this, I'm not going to indicates the grounds for more units because it cancels anyways, so this should give us a value off 82 point to 4%. So that's the percentage of nitrogen in this in the simple and ammonia. So in order to find the percentage of hydrogen. We could do the same thing we did. But that's unnecessary because after nitrogen, what's left in ammonia is hydrogen. So since some of these two should give us a sum off nitrogen, hydrogen in the sample should give us 100. We can say 100% minus percentage off nitrogen should give us the percentage of hydrogen. Because you know this compound ammonia is only made up of two elements. Nitrogen, hydrogen. So whatever's left after we calculated percentage off Master Jin should be hydrogen. So the percentage of hydrogen is going to be 100 minus 82 point to 4% which one sold should yield 17.76 percent. So we can do the same thing for the second part probie, which is friendly person composition off sodium fires off it, sort of various offered consists of sodium sulfur and oxygen. So the percent off prison composition of soldier Ms the mill amounts of sodium, which is 22 point my 90 Remember, we have to. So Liam's much like this by two in the world by the total Mallomars off so damn thyself it, which one calculated well upon my calculation. I was able to get 158 point. So you're a 97 and these units are in grants for more. But we can ignore them because they cancel each other. You won't believe this, but 100%. So this one sold, I get it. Valuables, 29.8 percent percentage of sodium. Now, let's complete the percentage of sulfur. And that is so for small Mass, which is 32.6 Remember, we have to suffer is present in Saudi anti selfie, it divided by the similar most, which is calculated 158.97 Let's buy that by 100 percent that when my calculation is 40 point by 6%. So since we found so don't the percent of sodium and saw for what's left is oxygen. So the president of Oxygen should be 100 minus. We calculated for sodium and so for 29.8, was what he went 56 That one calculated should give us 30.36 percent. Lastly, let's find percent off. Calcium, just like we've been doing, isn't of calcium. Two plus two is just a little muscle calls him, which is 40 point. They're 78 when we have three calls, comes results were four by three ready by the mole amounts of this costume force we sample, which I have cooperated to be 310 went once every four. Yeah, I grasp it more. Well, let's ignore that because the council, the new Andy, nobody of the units for both cancel my bed by 100%. And that one calculating excuses a volley of 38 0.76%.

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