3) mass of liquid = x grams, density = mass/vol
mass = density • vol
x grams = 2.5g/mL • 15mL = 37.5g
4) volume (y mL) = mass/density
y mL = 65g/(5.45g/mL) = 11.93mL
5) mass = 176g, density = mass / vol
vol (cube) = side(s)^3
s^3 = (4cm)^3 = 4cm • 4cm • 4cm = 64 cm^3
density = mass/vol = 176g/64cm^3 = 2.75g/cm^3
*note: for most scientific measurements,
1 cm^3 is equivalent to 1 mL, so the answer could also be written as: 2.75g/mL