Question

An experiment requires 13.0 g of cyclohexane, which has a density of 0.7781 g/mL at 25° C. What volume of cyclohexane should be used?
Express your answer using three significant figures.

Answer 1

To find the volume of cyclohexane needed, we can use the formula for density:

\[
\text{Density} = \frac{\text{Mass}}{\text{Volume}}
\]

Rearranging this formula to solve for volume gives:

\[
\text{Volume} = \frac{\text{Mass}}{\text{Density}}
\]

We are given:
- Mass of cyclohexane = 13.0 g
- Density of cyclohexane = 0.7781 g/mL

Now, we can calculate the volume:

\[
\text{Volume} = \frac{13.0 \, \text{g}}{0.7781 \, \text{g/mL}} \approx 16.7 \, \text{mL}
\]

Now, rounding to three significant figures, the volume of cyclohexane that should be used is:

\[
\boxed{16.7 \, \text{mL}}
\]