Question

1. the density of platinum is 21.45 g/cm³. what is the mass of a sample of platinum that has a volume of 3.50 cm³?

Explanation:

Step1: Recall density formula

The density formula is $
ho=\frac{m}{V}$, where $
ho$ is density, $m$ is mass and $V$ is volume. We want to find $m$, so we can re - arrange the formula to $m =
ho\times V$.

Step2: Substitute values

Given $
ho = 21.45\ g/cm^{3}$ and $V=3.50\ cm^{3}$. Then $m=21.45\ g/cm^{3}\times3.50\ cm^{3}$.

Step3: Calculate mass

$m = 21.45\times3.50\ g=75.075\ g$.

Answer:

$75.075\ g$