Answer:
20.91% of the hydrated calcium sulfate salt is water
Explanation:
<u>Step1</u> : Calculate the mass of H2O that evaporated
A hydrated salt has a mass of 1.803g. After heating at 170° C, this means water will evaporate, the mass of the salt is 1.426g
The difference is water that evaporated.
⇒Mass H2O of hydration =1.803 g - 1.426g g = 0.377 g H2O
<u>Step 2</u>: Calculate the % of water in the hydrated calcium sulfate salt
⇒ mass of H2O = 0.377g
⇒ mass of calcium sulfate salt = 1.803g
⇒ % water in the calcium sulfate salt = (0.377 / 1.803) x 100% = 20.91%
20.91% of the hydrated calcium sulfate salt is water
