Yes, you most certainly do. For example, CuSO4 has a molecular weight of 159.6g/mol, yet it's pentahydrate has a molecular weight of 249.684g/mol. If you didn't add in the pentahydrate. You'd have about 40% error in the molarity.
NaCl salt does not contain water of crystallization.
The molar mass of water is approximately 18.015 lb/lbmol.
To calculate the percentage of water in a hydrate, you first determine the molar mass of the water and the compound. Then, you divide the molar mass of the water by the molar mass of the hydrate and multiply by 100 to get the percentage.
No, when calculating the mass of borax needed to make a standard solution, you do not include the water of hydration (such as the 10H2O). You only consider the anhydrous borax (without water molecules) in your calculations.
1. Find the molar mass of the hydrate (Calcium Chloride Dihydrate).Find the molar mass of water and the anhydrate (anhydrate + water = hydrate); add the molar mass values of each to find the molar mass of the hydrate.Molar Mass CaCl2: 110.98g+ Molar Mass H2O: 36.04g*Molar Mass CaCl2 * 2H2O: 147.01gFinding Molar Mass# atoms element A * atomic mass element A = Mass A# atoms element B * atomic mass element B = Mass B... etc.Add up all the mass values and you have the value for molar mass. Do this for both the anhydrate and the water molecules. Add these values together to find the molar mass of the hydrate.Molar Mass Anhydrate + Molar Mass Water Molecules* = Molar Mass Hydrate* Tip: the molar mass of water for all hydrate calculations is 18.02g x number of water molecules. This number may be useful to remember on the day of the test or while doing practice problems.*2. Calculate the percentage of water in hydrate.Divide the molar mass of water by the molar mass of the hydrate, and multiply result by 100%.36.04g147.01g x 100%Percent water in hydrate is 24.52%.
You ca calculate the molar mass for an anhydrous compound or for the hydrated forms; it is your choice and depends on the available reagent.
H
Yes. There is no water of crystallisation.
NaCl salt does not contain water of crystallization.
The water of crystallization is a type of water contained in the molecular structure of a compound.
This can be done by heating the salt.
CaCl2 , the anhydrous (no water of crystallisation) form. There are various hydrates.
The molar mass of water is 18 g/mol.
de-watered crystals
No,it's a physical change Because there is no change in matter's composition.
A soluble salt turns into the crystalline form, usually with its water of crystallisation
To find the theoretical percent of water in a compound, you need to determine the molar mass of the compound and the molar mass of water. Then, divide the molar mass of water by the molar mass of the compound and multiply by 100 to get the percentage.