1. An unknown substance has a mass of 56.8 g and a volume of 23.4 mL. What is the density of this unknown substance?

To find the density of the substance, you need to use the formula:

Density = Mass / Volume

Plugging in the given values:

Density = 56.8 g / 23.4 mL

Calculating the density:

Density = 2.43 g/mL

Therefore, the density of the unknown substance is 2.43 g/mL.