Question
a solution of 30% ethanol by weight has a density of 0.96g/ml at 25 degree celsius. find the molarity.
Answers
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bobpursley
assume you have 1000ml of the stuff.
Then mass=.96*1000=960grams.
But 30 percent is ethanol, so
ethanol mass=288grams.
change that mass to moles (divide by mol mass of ethanol)
Molarity=molesEthanol/volumesolution=molesEthanol/1
Then mass=.96*1000=960grams.
But 30 percent is ethanol, so
ethanol mass=288grams.
change that mass to moles (divide by mol mass of ethanol)
Molarity=molesEthanol/volumesolution=molesEthanol/1