ANSWER
4.15 kg
EXPLANATION
We have the volume and density and we want to find the mass. The formula for density is:
[tex]\rho=\frac{m}{V}[/tex]Solving for m:
[tex]m=\rho\cdot V[/tex]First we have to adjust the units. The density is given in g/mL and the volume is given in liters, so we can find the equivalent volume in mL:
[tex]V=25L=25000mL[/tex]Now we replace and find the mass:
[tex]m=0.166\frac{g}{mL}\cdot25000mL[/tex]The mL gets cancelled and the result is in grams:
[tex]m=4150g[/tex]Which we have to divide by 1000 to find its equivalent in kilograms:
[tex]m=4.15\operatorname{kg}[/tex]