Question

what is the density of a piece of iron that has a mass of 0.3kg (1kg = 1000g) and a volume of 73cm3
0.004g/cm3
0.41g/cm3
4.1g/cm3

Explanation:

Step1: Convert mass to grams

Since $1kg = 1000g$, then $m=0.3kg\times1000 = 300g$.

Step2: Use density formula

The density formula is $
ho=\frac{m}{V}$, where $m$ is mass and $V$ is volume. Given $m = 300g$ and $V=73cm^{3}$, so $
ho=\frac{300}{73}\approx4.1g/cm^{3}$.

Answer:

C. $4.1g/cm3$