Ch 12 mol review.doc - Chemistry 12 Some Review of Chem 11...

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Chemistry 12Some Review of Chem 11 - Mole StuffPart 1 - Changing Moles to Grams and Grams to MolesThe two conversion factors to remember are:MM grams&1 mole1 moleMM gramsWhere MM stands for the Molar MassThe Molar Mass is calculated by adding up atomic masses from underneath the symbol andthe name on the periodic table.eg.The molar mass of Na2SO4is calculated as follows:2(23.0) + 32.1 + 4(16.0) = 142.1 grams/moleHere are some examples of converting using the conversion factors:1.2.60 moles of Na2SO4=_____ grams2.60 molesx142.1 grams=369.46 grams1 moleNOTE: In Chemistry 12 calculations, we must consider significant digitsThe 2.60 has 3 SD’s and the 142.1 has 4 SD’s. When multiplying, theanswer must be rounded of to the least # of SD’s in the numbers beingmultiplied. So this answer must to rounded to 3 SD’s.So the answer is 369 gramsANOTHER NOTE:If a calculation is just one step in a series of calculations,DON’T round of the answer. If possible, leave it in your calculator the way itis and go from there.
2.1053.24 grams of K2Se=_____ moles

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Mole, 2 moles, 0 014 moles, 0 1962 grams, 0 3558 grams

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