Molarity, Molality, Volume & Mass Percent, Mole Fraction & Density - Solution Concentration Problems

[@TheOrganicChemistryTutor]

Concentration - Free Formula Sheet: bit.ly/3YfzBTf Full 1 Hour 20 Minute Video: bit.ly/3GuiDXd Chemistry 1 Final Exam Review: kzbin.info/www/bejne/a6raYox-bL50bcU Chemistry PDF Worksheets: www.video-tutor.net/chemistry-basic-introduction.html

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Professor Organic Chemistry Tutor, thank you for an exceptional explanation of Molarity, Molality, Volume Percent, Mass Percent and Mole Fraction in AP/General Chemistry.The practice problems uses conversions and well known formulas to calculate Molarity,Molality, Volume/Mass Percent and Mole Fraction. Conversions is very important in all levels of Chemistry. This is an error free video/lecture on KZbin TV with the organic Chemistry Tutor.

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29:04 in this question- you can use the formula p%×d×10/molar mass of solute

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[@normal725]

I hope you will read this, but I would like to know (14:09) why is the 150mL of H2O was the solute? From what I have solved from that problem it is supposed to be 19.8g of methanol instead of the water so the mass percent of the water is supposed to be 11.7% not 88.3%. I am a fan of your videos I hope you could correct this for us.

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now i know cuz girl u need to find the mass percentage of the water instead of the methanol so therefore the water becomes the solute hehe

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It's not that the water really becomes the solute, The mass percent could also be of the solvent rather than the solute. Water will not be solute. The solute is always the one in lower quantity. Don't write it in the exam that water becomes the solute

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Here you need to find the mass percent of the solvent I believe so they've written it like that

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[@kennykutelu745]

To get the v% ,you have to first get the volume of solution.which is volume of solute + volume of solvent,i.e 150ml volume of solvent plus 25ml volume of soulute.. although methanol and water are substances that can be used in dissolving i.e they can both be seen as solvent.But, since the volume of water in this case is higher than that of methanol,he simply made methanol the solute and water the solvent.

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