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Okay s eighty math shmoop er's We've got another siri's

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of five questions from you and here we might actually

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pull from these formulas This thing this reference information thing

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here with the dunce cap on it You know that

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thing you used to wear that Okay here we go

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Question One of five Mole different kind of mall is

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a unit used in chemistry to measure adam's molecules electrons

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and other particles in a given amount of substance We

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know that the mueller mass of mercury is approximately two

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hundred grams per mall Using a small calibrated test tube

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containing water a scientist is able to determine that the

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volume of a small amount of mercury that he will

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use in his experiment is twenty four point five cubic

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centimeters If mercury has a density of thirteen point five

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grams per cubic centimeter How many moles and mercury are

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in the twenty four point five cubic centimeters there around

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your answer Okay Well so how do we think about

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this Well let's start with a little prayer Mercury is

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a roman god yes A planet and element And now

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the subject of a math problem First right What's given

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That is specific about the situation right Which is the

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volume of twenty four point five cubic centimeters Hey you've

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got one free point there A partial credit just for

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doing that Then look for the ratio that relates cubic

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centimeters to a different unit huh Where would that be

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Well in this case the ratio is density and it

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relates Cubic centimeters Two grams You just multiplying together making

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sure that everything lines up like this And this is

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the hard part in this question If you get this

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equation right well life will go swimmingly We've got better

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Units of cubic centimeters are in the numerator and denominator

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So what happens Yes they cancel each other out Conveniently

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like a smart people in congress were left with quite

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a few grams of mercury here So we should find

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something else in our toolbox of information that relates grams

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to another unit question Wants units of moles So there's

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good direction and go here We've got three hundred thirteen

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point seven five grand times One mole over two hundred

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grams About one point Seven moles The number you get

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in your calculator will be a one point six five

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Three seven five of the problem ask you to run

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to the nearest tenth just round up to one point

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seven and also noticed that we flipped the ratio of

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moles program around to convert our final answer In two

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moles we were told there were two hundred grams for

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everyone mole but we're using moles in the numerator so

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we can do this whenever we're presented with this conversion

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factor thing Yeah you can look at it right here

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it's all free on him up At least this party's

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All right we're done answered one point Seven and i

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were just going to move on from this weird looking 00:02:38.728 --> [endTime] mole Thanks dude

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