3. Complete the following density problems. Be sure to express your answers with the proper number of sig figs.

Question

3. Complete the following density problems. Be sure to express your answers with the proper number of sig figs.

D. Calculate the density, in units of g/mL, of a 0.0200 L sample of a salt solution that has a mass of 2.40 x 10^-5 Mg.

Answer 1

To express density in g / ml units, we'll need to convert Mg to g and L to ml.

2.40x10^-5 Mg x 1 g / 1x10^-6 g = 24 g

0.0200 L x 1000 ml / L = 20 ml

Density = 24 g / 20 ml = 1.20 g / ml (3 sig. figs.)