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    kenny-g's Avatar
    kenny-g Posts: 2, Reputation: 1
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    #1

    Oct 3, 2007, 05:38 PM
    Steps for solving
    Sucrose has a denisty of 1.58g/ml. What is the mass of 87.5 ml of sucrose
    kenny-g's Avatar
    kenny-g Posts: 2, Reputation: 1
    New Member
    		  
    #2

    Oct 3, 2007, 05:38 PM
    8.5
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #3

    Oct 3, 2007, 10:23 PM
    The units have to be right. If you have (B g/ml) and (C g), arrange the ratios such that the units cancel. In this case: (B g/ml) * ( 1/(C g)). The units of the answer would be in units of grams.

    Conversions of length can be done the same way:
    Suppose 2.54 cm = 1"; 12" = 1' and you were asked "What is the number of feet in 30 cm"?

    You know you have 30'
    You multiply 30' x 12"/1' and I have the result in inches because units cancel.
    You then take (30' x 12"/1') and multiply by 2.54 cm/1" and I get the result in cm.
    feet * inches/feet * cm/inches = cm
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