Final answer:
To calculate the percent hydration of a calcium hydrate heated to yield an anhydrous salt, subtract the final mass from the initial mass to find the mass of water lost, then divide by the initial mass, and multiply by 100. The result is 26.6%.
Step-by-step explanation:
The student's question deals with the concept of hydration and dehydration of a hydrate, specifically calcium hydrate. When heated calcium hydrate loses water, resulting in a mass loss. To find the percent hydration, we calculate the mass of water lost during heating by subtracting the final anhydrous mass from the initial hydrated mass.
The mass of water lost is the difference between the initial mass of the hydrate (5.00 g) and the final anhydrous mass (3.67 g), which is 1.33 g. The percent hydration is calculated by taking the mass of the water lost, dividing it by the initial mass of the hydrate, and then multiplying by 100. Therefore, the percent hydration is (1.33 g / 5.00 g) * 100, which equals 26.6%.