If the unknown fluid has a density of 3.1 and volume of 25 what is the mass of the liquid in grams

Density (D) is the obtained quotient when the mass (m) of the substance is divided by the volume (v) it occupies. 
 
                        D = m / v       ;      m = D x v

Assuming that the given density has a unit of grams per mL and substituting the known values to the equations,
 
                                           m = (3.1 g/mL) x 25 mL
 
                                              m =77.5 grams

Thus, the answer is 77.5 grams.

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