An experiment requires 13.0\({\rm g}\) of cyclohexane, whose density at 25 \(^\circ {\rm C}\) is 0.7781 \({\rm g/mL}\). What volume of cyclohexane should be used?

mass = volume x density

Substitute and solve.

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

Volume = Mass / Density

From the question, we know that the mass of cyclohexane required is 13.0 g and the density of cyclohexane is 0.7781 g/mL.

Substituting these values into the formula, we have:

Volume = 13.0 g / 0.7781 g/mL

Now we can calculate the volume:

Volume ≈ 16.71 mL

Therefore, the volume of cyclohexane that should be used for the experiment is approximately 16.71 mL.