ALEKS Using Mass Percent Composition…
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ALEKS Using Mass Percent Composition…

September 27, 2019


Hello today we want to just work on this problem from the Alex homework system So the problem says a chemistry student needs 10 grams of 2- ethyl toluene for an experiment he has available 300 grams of a 26.3% weight by weight solution of 2 ethyl toluene in ethanol Calculate the mass of solution the student should use if there’s not enough solution press the no solution button So here’s what it’s illustrating it says That we have a solution So ethanol is a liquid So I’m just going to draw a little picture of a beaker with some liquid in it so to illustrate what we’re talking about And it says it weighs 300 grams. This is the whole solution 26.3% of that solution is the solute 2- ethyl toluene? And I’m just gonna abbreviate that to save space as 2f we know it’s 2 eth stands for two ethyl toluene Now in this problem. It’s not important to actually know what these things Are you don’t have to know what 2- ethyl toluene is exactly or what ethanol is except that this is the solute dissolved in this solvent to make the total solution Then it asks us calculate the mass of solution the student should use so to figure that out we start with the grams of the two ethyl toluene that we need So we start with 10 point zero zero grams of two ethyl toluene that the student is needing to measure out for his experiment and We use the percentage as a conversion factor so in this says 26.3% of two ethyl toluene that means that there are twenty six point three grams of two ethyl toluene For every 100 grams of the solution, so that’s how we’re going to use The percentage as our conversion factor so we started here with 10 grams of two ethyl toluene and Because we need our units to cancel put the twenty six point three grams of two ethyl toluene on the bottom And the 100 grams of the total solution On top and we’re done art grams of two ethyl toluene cancels The grams of solution that we need to end with or on top, so that’s good. We’ll check up here Note that it is saying calculate the mass of solution so that is the unit that we wanted to end with We plug this into our calculator And get that it is thirty eight point zero grams of the solution Now the question asks us if there’s not enough solution press in no solution button So we’ll look back up and we’ll see our answer. It was we need thirty eight point zero grams of solution To have 10 grams of two ethyl toluene in it To know if we had enough we just look back up and see we had 300 grams originally so sure we have more than enough to pour out 38.0 grams of the solution so we go get our measuring device graduated cylinder or whatever we’re going to use for this particular measurement and pour out 38.0 grams of solutions, thank you and happy studying

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