Specific gravity of nitrobenzene: mass, flow rate, and mixture density

[XBOX999]

Homework Statement

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.

Homework Equations

SG=p/pref
v=m/p

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

 

[Tom Creswell]

Mix density = total kg / total liters (or total lbs/ total cu ft). Figure out both totals, then divide.