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24 August, 17:30

If you are given ethanol (C2H5OH) 6.5lbs / gal and you have 2 gallons how many moles do you have?

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  1. 24 August, 18:16
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    128.2 moles

    Explanation:

    Data Given:

    Amount of ethanol (C₂H₅OH) = 6.5 lbs / gal

    moles of ethanol (C₂H₅OH) = ?

    Solution:

    As we have 6.5 lbs per gallon, So, 2 gallons will have total amount of ethanol (C₂H₅OH) will be

    Total amount of (C₂H₅OH) will be = 2 x 6.5 lbs

    Total amount of (C₂H₅OH) will be = 13 lbs

    Now,

    Convert lb to grams

    1 lb = 453.6

    13 lbs = 13 x 453.6 = 5897 g

    So, we have 5897 g of ethanol.

    Now we have to find number of moles, for which formula will use

    no. of moles = mass in grams / molar mass

    Molar mass of C₂H₅OH = 2 (12) + 5 (1) + 16 + 1

    Molar mass of C₂H₅OH = 24 + 5 + 16 + 1

    Molar mass of C₂H₅OH = 46 g/mol

    Put values in the above formula

    no. of moles = 5897 g / 46 g/mol

    no. of moles = 128.2 moles

    no. of moles of ethanol = 128.2 moles
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