ethanol is a common laboratory solvent and has a density of .0789 g/mL. what is the mass, in grams, of 141 mL?

density = mass/vol

mass = density x vol

0.0789 141 =11.124 g

There with explanation (:

First the rule says:

Density = Mass / Volume ===> Mass = Density x Volume.

Now, you're given the density and volume:

- Density (p, rho) = .0789 g/mL

- Volume = 141 mL

Apply the rule:

Mass = .0789 g/mL x 141 mL = 11.12 g. (mL is cancelled by mL, we obtain grams unit).

P.S: No need for conversion of units because they are both in mL, convert units only if they are different like mL and L, etc...

Hope I helped (:

p (rho in greek correctly) = density

m = mass

V = volume

you have 0.789 g/mL (not 0.0789 that's incorrect) = rho

V = 141.mL

Rearrange m = rho x V = 0.789 g/mL x 141 mL (mLs cancel you get grams - a unit of mass!)

N.B don't mix units on this e.g mL and L or g and kg