Both joules and kilocalories are units of measurement for energy. This means that the solution to this problem can be solved just by converting the units using the appropriate conversion factors. One kilocalorie is equal to 4,184 joules. Multiply 0.5720 kcal by 4,184 to get the value in joules. This gives 2,393.25 joules.
Answer:
32.4%
Explanation:
Given parameters:
Mass of hydrated sample = 25g
Mass of anhydrous salt = 16.9g
Unknown:
Percentage of water in the hydrate = ?
Solution:
Obviously, there is a mass difference between the original hydrated sample and anhydrous salt which should indicate clearly that the mass loss is due to the evaporated water from the salt.
Mass of salt of water = mass of hydrated salt - mass of anhydrous salt
= 25g - 16.9g
= 8.1g
Percentage of water =
=
= 32.4%
1. False
2. False
3. True
4. True
5. True