Rachel is asked to calculate the density of a liquid. She correctly measures the mass of the liquid to be 13.9 grams, but she incorrectly measures the volume of the liquid to be 8 mL.

The actual volume of the liquid is 7 mL.

If Rachel uses the following equation to calculate the density of the liquid

nor I - what equation?

Rachel can use the equation: density = mass / volume.

First, Rachel needs to calculate the correct volume of the liquid. She measured the volume to be 8 mL, but the actual volume is 7 mL. To find the correct volume, she needs to subtract the difference between the measured volume and the actual volume:

Correct volume = Measured volume - (Measured volume - Actual volume)
= 8 mL - (8 mL - 7 mL)
= 8 mL - 1 mL
= 7 mL

Now that she has the correct volume, she can substitute the values into the density equation:

Density = Mass / Volume
= 13.9 g / 7 mL

Now Rachel can calculate the density of the liquid:

Density = 13.9 g / 7 mL
≈ 1.986 g/mL

Therefore, the density of the liquid is approximately 1.986 g/mL.