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March 26, 2017

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a solution of 30% ethanol by weight has a density of 0.96g/ml at 25 degree celsius. find the molarity.

  • Science - definitely not 3rd grade! - ,

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  • 3rd grade - ,

    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

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