To determine the mass of pentane the student should weigh out
Mass - density ratio formula
[tex]\text{Density = }\frac{Mass}{Volume}[/tex][tex]\begin{gathered} \text{Density = }\frac{Mass}{Volume} \\ Mass\text{ of pentane = Density of pentane x Volume of pentane} \\ Density\text{ }of\text{ pentane = 0.626 g.cm} \\ Volume\text{ of pentane = 25ml} \end{gathered}[/tex][tex]\begin{gathered} 1\text{millilitre = 1 cubic cm } \\ 25ml=25cm^3 \\ \text{volume of pentane = 25cm}^{3^{}} \end{gathered}[/tex][tex]\begin{gathered} \text{Mass of pentane = Density x Volume} \\ \text{Mass of pentane = 0.626 g. cm x 25 cm}^3 \\ \text{Mass of pentane = 15.65g} \\ \text{Mass of pentane }\cong\text{ 16g } \end{gathered}[/tex]Therefore the answer for the mass of pentane = 16g (1significant figure)
