Question

What is the volume of a solution that has a mass of `21.0*g` and has a density of `19.3*g*mL^-1`?

Answer 1

A bit over `1*mL..........`

Explanation:

`"Density,"` `rho` `=` `"Mass"/"Volume"`, and we use this quotient.

We have `rho` and `"mass"`. And thus we perform the operation:

`"Volume"` `=` `"Mass"/rho` `=` `(21.0*cancelg)/(19.3*cancelg*mL^-1)` `=` `??*mL`.

Dimensionally, this is sound. We want an answer with units of volume, we get an answer with units: `1/(1/(mL))=mL` as required. The use of dimensions in your answer allow you to decide whether you are correct when you divide instead of multiply or vice versa.