Question

calculate the density of an object. if the mass is 19 g and the volume is 21 ml.
density = \frac{mass}{volume}
remember to select an answer with the correct number of significant figures.

Explanation:

Step1: Recall density formula

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

Step2: Substitute given values

Given $m = 19\ g$ and $V=71\ mL$. So, $
ho=\frac{19\ g}{71\ mL}$.

Step3: Calculate density

$
ho=\frac{19}{71}\ g/mL\approx 0.27\ g/mL$.

Answer:

0.27 g/mL (Note: Since the original options are not clearly - legible in the provided image, this is the calculated value following the density - calculation steps. If the options were correct and legible, we would choose the closest one with the correct significant figures.)