0
Do you include water of crystallisation when calculating molar mass?
Wiki User
∙ 10y ago
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.
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
Which crystal does not contain water of crystallisation?
Diamond is a crystal that does not contain water of crystallisation because it is composed solely of carbon atoms arranged in a crystalline structure.
What is the theoretical percentage of water of hydration in cacl2-2h20?
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%.
What is the percentage of water to the nearest tenth in this compound BaOH2 8H2O?
The compound Ba(OH)2·8H2O has 8 water molecules associated with it. To find the percentage of water in the compound, calculate the molar mass of the water molecules (8H2O) and the molar mass of the entire compound (Ba(OH)2·8H2O). Then divide the molar mass of the water by the molar mass of the entire compound and multiply by 100 to get the percentage of water.
Molar heat capacity of water?
The molar heat capacity of water is 75.3 J/mol K at constant pressure. This means that it takes 75.3 joules of energy to raise the temperature of one mole of water by 1 Kelvin.
Molar mass of 158g of ice?
The molar mass of ice is 18.015 g/mol. To find the number of moles in 158g of ice, divide the mass by the molar mass: 158g / 18.015 g/mol = 8.77 moles.
Why do you include water of crystallisation calculating molar mass?
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.
What is meant by water of crystallisation in a substance?
H
Is Na Cl anhydrous?
Yes. There is no water of crystallisation.
How do you isolate a solid that is dissolved in water?
Perform crystallisation.
What is water of crystallisation?
The water of crystallization is a type of water contained in the molecular structure of a compound.
Which crystal does not contain water of crystallisation?
Diamond is a crystal that does not contain water of crystallisation because it is composed solely of carbon atoms arranged in a crystalline structure.
How can you separate the water from the salt of crystallisation?
This can be done by heating the salt.
Does washing soda lose water of crystallisation completely?
No, washing soda does not lose all its water of crystallization completely. It still retains some water molecules even after heating to remove excess water and become anhydrous.
What the molar mass of water?
The molar mass of water is 18 g/mol.
What is the formula or calcium chloride?
CaCl2 , the anhydrous (no water of crystallisation) form. There are various hydrates.
What is the general name given to crystals that have lost all their water of crystallisation?
de-watered crystals
Is crystallisation of water a chemical change?
No,it's a physical change Because there is no change in matter's composition.
