Find the density of mercury if 205ml has a mass of 2790 h; round your answer to the nearest 0.1 g/ml

The density of a substance is simply calculated as the ratio of mass over volume. That is:

density = mass / volume

Therefore calculating for the density of mercury:

density = 2790 g / 205 mL

density = 13.61 g / mL

Rounding off to the nearest  0.1 g / mL:

density = 13.6 g / mL