The density of potassium (K), is 8.56 × 102 kg/m3. Convert the density to g/cm3.

$$ 1\:\operatorname{kg}=1000\:gram $$ $$ 1\:m=100\:\operatorname{cm} $$ $$ \therefore1\:m^3=\left(100\:\operatorname{cm}\right)^3=1000000\:cm^3 $$ $$ 8.56\times102\:kg\:per\:m^3=\left(8.56\times102\right)\times\frac{1000}{1000000}\:gram\:per\:\operatorname{cm}^3 $$ $$ density\:\left(in\:gram\:per\:cm^3\right)=0.87312\:gram\:per\:cm^3\approx0.873\:gram\:per\:cm^3 $$