Question

Calculations: 1. Calculate the formula mass/molar mass of the anhydrous salt of your unknown sample (show calculations). mass of unknown = 1.099 mass of unknown and hydroussalt -37.40 a mass of water loss = 0.389 2. Calculate the number of moles of the anhydrous salt (show calculations). 3. Calculate the number of moles of water in the unknown hydrate (molars mass of H,0 18.02 g/mol). Show calculations. 4. Determine X: show calculation step 5. Molecular formula of your unknown hydrate:

use the information given on the Nickle II sulfate to do the calculations

Answer 1

Calculations: 1. Calculate the formula mass/molar mass of the anhydrous salt of your unknown sample (show calculations). mass ot unknouan mass o4 un knaun and hydraus salt 31 mass ot water 0.3g loss 2. Calculate the number of moles of the anhydrous salt (show calculations) Mass of anhydrous salt = 0.71 gm Moles of anhyd rous salt 0.71 gm/154.75 g/mol 0.004588 Moles 3. Calculate the number of moles of water in the unknown hydrate (molars mass of H,0 18.02 g/mol). Show calculations. Moles of water = 0.38 gm/18 gm/mol = 0.021111 Moles 4. Determine X: show calculation step it is not a whole number. There might be some while weighing. Hence we can near by whole number which is 5 X= 0.02111 = 4.6 0.004588 5. Molecular formula of your unknown hydrate: NisO4. 5H20