Answer
25.1 mL or 25.1 $cm^{3}$ is the volume of ethanol that should be poured into the graduated cylinder.
Work Step by Step
1- We know that density, volume , and mass are related through density formula: d = $\frac{m}{v}$
By multiplying both sides with v we get an identical equation with this one, that we can use to find mass. d x v = $\frac{m}{v}$ x v m = d x v
v = $\frac{m}{d}$
2- Replace values of mass and density to find the volume.
mass is 19.8 g
density is 0.789 $\frac{g}{cm^{3}}$ (Note: it is important to always check the units before you replace the values in the formulas.)
v = $\frac{m}{d}$
v = $\frac{19.8 g}{0.789 \frac{g}{cm^{3}}}$
v = 25.095 $cm^{3}$
we know that 1 ml = 1 $cm^{3}$ ), so we can write
v = 25.095 mL
considering the significant figures, e write:
v = 25.1 mL or v = 25.1 $cm^{3}$
