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  • 23-09-2014 9:42pm
    #1
    Justine Purcell
    Registered Users, Registered Users 2 Posts: 7 ✭


    Can someone help me convert 1mg/100ml to moles/litre for methanol which has a molecular mass of 32.04g/mol


Comments

  • #2
    dlouth15
    Registered Users, Registered Users 2 Posts: 1,169 ✭✭✭dlouth15


    The concentration is 1mg/100ml. Solve this by expressing 1mg in moles and 100ml in litres and dividing the first figure by the second.

    1. Convert 1mg of ethanol into moles.

    We know that 1 mole is 32.04g. Therefore 1g is 1/32.04 moles. 1mg is that figure divided by 1000, so 1mg is 1/(32.04*1000) moles.

    2. Convert 100ml into litres. 100mL is 0.1L.

    3. Now express the concentration in those terms by dividing (1) by (2).

    (1/(32.04*1000) moles)/(0.1L)= (1/(32.04*1000))/(0.1) moles/litre.

    =0.00031211 moles per litre or 3.1211x10^-4 mol/L in scientific notation.


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