## General Chemistry 10th Edition

25.1 mL or 25.1 $cm^{3}$ is the volume of ethanol that should be poured into the graduated cylinder.
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 $cm^{3}$