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QUESTION

# A perfect cube was found to have a mass of 16.2 g . If the density of aluminum is 2.7 g/cm what is the length of each side of aluminum?

The thing I want to point out is that is defined as mass over unit of volume. Therefore, regardless of what actual unit you use to express it, you must always have a unit of mass divided by a unit of volume.

The of aluminium should therefore be expressed in "g/cm"^3, since "g/cm" is actually a measure of mass per length, not per volume.

That being said, you go about solving this problem by using the formula for density

rho = m/V => V = m/(rho)

In this case,

V_("cube") = m_("cube")/(rho) = "16.2 g"/(2.7 "g"/"cm"^3) = "6.0 cm"^3

SInce you're dealing with a perfect cube, the volume can be expressed as

V_("cube") = "side"^3

Therefore,

"side" = root(3)(6) = "1.82 cm"