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Page 11 of 27
Question 11 (5 points)
When 82.5 g of calcium nitrate reacts with 25.0 g of aluminum nitride forms calcium
nitride and aluminum nitrate.
3 Ca(NO3)2 (aq) + 2 AIN (s) → Caz N2 (s) + 2
Al(NO3)3 (aq)
How much aluminum nitrate is produced?
(Include correct units and significant figures in your answer)

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%