The value of mass is 680 g.
It is defined as mass per unit volume.
Given:-
[tex]Density=13.6\ g/cm^{3} \\Volume=50\ mL[/tex]
Calculate mass as follows:-
[tex]Density=Mass/Volume\\13.6\ g/cm^{3} = Mass/50.0\ mL\\Mass=13.6\ g/cm^{3} \times50.0\ mL[/tex]
Relationship used:-
[tex]1\ cm^{3} =1\ mL[/tex]
[tex]Mass=680\ g[/tex]
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