Final answer:
The question appears to contain a discrepancy between the mass and volume given for the enamel silver jewel, preventing an accurate determination of what part of the total mass is enamel. Therefore, the options provided cannot be determined without additional information or correction of the data.
Step-by-step explanation:
To find what part of the total mass is enamel in an enamel silver jewel with a mass of 93 kg and a volume of 10 cm³, we first need to use the density formula density = mass/volume to calculate the mass of silver and enamel that could occupy this volume separately. The density of silver (Ag) is given as 10.5 g/cm³, and that of enamel is 2.5 g/cm³.
For silver, the mass would be 10 cm³ * 10.5 g/cm³ = 105 g of silver. For enamel, the mass would be 10 cm³ * 2.5 g/cm³ = 25 g of enamel. However, the total mass of the jewel is much larger (93 kg), indicating that the given volume and densities do not match the mass. Either the mass or volume provided in the question is incorrect, or the piece is made up of several materials with different densities, and a more complex calculation is required.
In this scenario, without additional information, we cannot accurately decompose the mass into silver and enamel parts. The given options (22.5%, 15%, 7.5%, 5%) cannot be determined from the provided data, and thus the student may need to double-check the information or approach the problem assuming a hypothetical or ideal case where the entire volume is occupied by just one of the materials, which still wouldn't align with the given mass.