Question

a chemist is trying to identify an unknown metal and finds that 25.0 cm³ of the substance has a mass of 224.43 g at 20.0 °c. which of the following metals is it? a aluminum, d = 2.70 g/cm³ b iron, d = 7.87 g/cm³ c copper, d = 8.98 g/cm³ d silver, d = 10.5 g/cm³ e gold, d = 19.32 g/cm³

Explanation:

Step1: Recall density formula

The density formula is $d=\frac{m}{V}$, where $d$ is density, $m$ is mass and $V$ is volume.

Step2: Substitute given values

We are given $m = 224.43\ g$ and $V=25.0\ cm^{3}$. So $d=\frac{224.43\ g}{25.0\ cm^{3}}$.

Step3: Calculate density

$d = 8.9772\ g/cm^{3}\approx8.98\ g/cm^{3}$

Answer:

C. copper, $d = 8.98\ g/cm^{3}$