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Homework Help: Can you help me please

  1. Jan 24, 2010 #1
    1. The problem statement, all variables and given/known data

    The specific gravity of nitrobenzene is 1.20.
    a) Calculate the mass in kg of 250 litres of nitrobenzene.
    b) Calculate the volumetric flow in mL/min corresponding to a mass flow of 30 lbm/h of nitrobenzene.
    c) Calculate the density of a mixture composed of 20 litres of nitrobenzene and 3 ft^3 of benzene (SG = 0.879), by supposing that the volume of the mixture is the sum of the volume of the two substances.

    2. Relevant equations

    SG=p/pref
    v=m/p

    3. The attempt at a solution
    a) I got 1.2*250=300 kg
    b) I got v= 183.33 ml/min
    C) I do not know how to solve it
    I find 3ft^3= 84.950
    and I do not how to solve it?Please help me
     
  2. jcsd
  3. Jan 25, 2010 #2
    Mix density = total kg / total liters (or total lbs/ total cu ft). Figure out both totals, then divide.
     
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