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Stoichiometry: Mass to Mass Stoichiometry

Added Jan 26, 2016 •

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mr. Causey coming to you from beautiful and tasks Texas with another problem of the weekend this week's problem is going to deal with a mass to mass calculation so let's make sure we have the things we need do you need a calculator to do some plug-in and chugging you need a periodic table you might even need your pot Atomic ion sheet if you have and you need to know some things you need to be sure you know how to write chemical formulas you need to be sure you can write a balanced chemical equation and you need to the basis of Stoichiometry and of course your videos for each of these situations and you can go to my YouTube channel and check them out alright the problem locate the mass of potassium iodide required to yield 1.78 G of mercury 2 iodide not this problem isn't complete there's some things that need to be examined here so one of the first things really should do with problem like this is analyze it and so the analysis instead I want to find out how much potassium iodide or Ki it's going to take to produce 1.78 G of mercury 2 iodide what's hgi2  now when I look at a problem like this I realize I need a balanced equation but I don't have one so let's plan what I want to do and then go get an equation  and it what I want to do is I want plan out the grams to moles of mercury I died and then check the moles of mercury iodide and convert 2 moles of potassium iodide and then two grams of potassium iodide so I have a grams to moles 2 moles to grams in order to do that I need to know more masses which you can see more masses are already in the problem but I also need to go from moles of mercury 2 iodide to moles of potassium iodide and order that I have to have the mole ratio can order to get the mole ratio I need a balanced equation so what I'm going to do here is first of all convert my mole my grams per mole then let's find an equation and I bet that if we look into or for look into some of our textbooks we can stop how Mercury 2 iodide is prepared and come up with an equation sold moles of mercury I die imma take my grams multiply to the molar mass and crush up my units  that's just checking my analysis and my ass going to be .00 to 392 moles of mercury 2 iodide but in order to change this to moles of potassium Indian equation and I just so happy just so happens that I found an equation in one of my textbooks and the equation is the proper mission of Mercury Mercury 2 iodide and it's written the right there on the Blackboard for you with that I realize that my you sure he's going to be 2 to 1 so let's go and change it to moles of potassium now that I have the moles of potassium Ida I can go ahead and X the mole ratio crotch out my unit always check your dimensional analysis when you do your unit analysis or with some people have dimensional analysis you're going to be sure that you set it up right and that gives me close-up attach modern that's what I want plug and chug and there's my value  now my next step is just to take the moles of potassium iodide and change grams of potassium iodide and we can do that pretty easy  Jazz X the molar mass cross out are units  and Wallah we get our grandma's potassium iodide and we have about three SigFig because of our original numbers let's recap  we change grams to moles and that was with the Mercury then we rode a balanced equation and actually had to go and find it can we determine the mole ratio and change moles to grams we also did a moles to moles change their to dently if you have any questions be sure to send an email to mr. Causey at mr. Causey check out which causes world.com and look at the Powerpoints and notes that are available to you  and of course be sure to subscribe if you turn already to my YouTube channel Papillon zip codes

Uploaded by Laura Houston.

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Stoichiometry: Mass to Mass Stoichiometry

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