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.
First, it's important to convert the mass into grams, since density is commonly expressed in grams per cubic centimeter (g/cm³).
1 kilogram = 1000 grams, so:
\[ 0.25 \ \text{kg} = 0.25 \times 1000 \ \text{g} = 250 \ \text{g} \]
Now we can use the density formula:
\[ \text{Density} = \frac{250 \ \text{g}}{320 \ \text{cm}^3} \]
Now, carrying out the division:
\[ \text{Density} = \frac{250}{320} \approx 0.78125 \ \text{g/cm}^3 \]
Thus, the density of the apple juice is approximately 0.78 g/cm³.