Answer
$$ 2.74 \space cm^3$$
Work Step by Step
As we have calculated in the last exercise (2.98a), the mass of the necklace is equal to 42.5 g.
$$15.5 \space g= 1 \space cm^3$$
$$42.5 \space g \times \frac{1 \space cm^3}{15.5 \space g} = 2.74 \space cm^3$$
