To calculate the density of a substance, you can use the formula:
\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \]
In this case, the mass of the apple juice is 0.25 kilograms and the volume is 320 cm³. We need to convert the mass into grams to match the units of volume (since 1 kilogram = 1000 grams):
\[ \text{Mass} = 0.25 , \text{kg} \times 1000 , \text{g/kg} = 250 , \text{g} \]
Now, using the formula for density:
\[ \text{Density} = \frac{250 , \text{g}}{320 , \text{cm}^3} \approx 0.78125 , \text{g/cm}^3 \]
When rounded to two decimal places, the density of the apple juice is approximately 0.78 g/cm³.
Therefore, the correct response is:
0.78 g/cm³ (or 0.78 g per cm cubed)