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Calculate the number of atoms in a 9.34 x [0? g sample of lithium:number of atoms:...

Question

Calculate the number of atoms in a 9.34 x [0? g sample of lithium:number of atoms:

Calculate the number of atoms in a 9.34 x [0? g sample of lithium: number of atoms:



Answers

Calculate the number of grams of lithium that contain the same number of atoms as 1.00 $\mathrm{kg}$ of zirconium.

So we have to turn to the number of atoms in 3.5 grams of gold. So let's convert the grams into moles by dividing by the molar Mass. Which ISS for gold. It's 1 96.97 or 97 grams is equal to in these grants. Cancel difficult to the 0.0 one certain eight mo's and lots about this, by God you. His number. It's brought up two times. 10 to 23rd Adams in this iniquitous in one point server in terms 10 toe 22nd adults.

The first step of this problem is to identify what we know and what we want. So what we know is that we're starting with to 0.0 grams of hydrogen and that hydrogen has an atomic mass of one point. 01 a, um, you This can also be written as grams, Per no. And what do we want? We want to know how many Adams are in two grams of hydrogen. Okay, so let's start with what we know. We know that we're looking at two grams of hydrogen, and we also know that the molar mass of hydrogen is 1.1 grams per mole mole. Transferring our units from grams to moles gets us one step closer to the number of atoms. So to do this, you can divide to by the molar mass of 1.1 that will cancel out the unit of grams and leave you with moles on top of your fraction. To calculate this, I ended up putting it into a calculator and I got 1.98 moles of hydrogen. Okay, so now we have moles and we want to get to the number of atoms so do we know any numbers that could help us with this? How about all the God Rose number? All the God Rose number is 6.2 to times 10 to the 20 full third. Adams Permal. This could be used to transfer the number of moles that we have to Adams. And how would we do this? We would multiply 1.98 buy off the Dodgers number so that the number so that the unit of moles would cancel out and you'll see that it does, because it's on the top and the bottom of the fractions. I also put this into my calculator and ended up getting 1.19 times 10 to the 24 Adams of hydrogen. Now, this is not the right number of sick fix, because if you look at the info that we were given, we see that go variable with the least number of sig figs is 2.0 grams of hydrogen. This means that we are answer needs toe have to sig figs. So, to round this answer, it would be 1.2 times 10 to the 24th Adams of hydrogen. And that's the number, the number of atoms in two grams. So I'm going to circle this because it is our final answer.

So this question. I asked us to find the number of atoms in each of the following samples, so we begin with fourteen point nine five five grams of chromium. So the first thing we want to do before we can convert toe Adams's convert to moles and so Chromium Sze Molecular masses fifty one point nine nine six grams per mole us from the periodic table. So Graham's cancel. Now we want to convert moles into atoms. And so one mall. It's six point oh two, two times ten to the twenty third Adams. And so moles cancel and our final answer will be in Adam's of chromium. So when we do this, we find that we have one point seven three two times ten to the twenty third Adams of chromium and some moving on toe. Let her be. Now we have thirty nine point seven three three grams of sulfur. We do the same thing we did in a where we take the molecular mass of software from the periodic table thirty two point oh, six grams per mall and then we just convert moles in tow. Adam's using avocados number six point oh two, two times ten to the twenty third Adams in one more. And so we do this math and we find our answer to be seven point four six three two times ten to the twenty third Adams of sulfur. So moving on the letter C this time we have twelve point eight nine nine grams of platinum. We first convert this into moles using platinums Moler, Mass. One point nine five zero eight grams per mall and then convert malls into Adams by using avocados. Number six point two two times ten to the twenty third Adam's Permal. And so again we solve this and we find out that we have three point nine eight one eight times ten to the twenty seconds Adams of platinum. So moving on finally, a letter d we have ninety seven point five five two grams of tin. We use the Mueller massive ten one eighteen point seven one grams per mall and then again convert moles into Adam's using Abba. God rose number six point two, two times ten to the twenty third, and we saw this to find that we have four point nine four eight seven times, ten to the twenty third Adams of ten


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