How much heat is released when 80 grams of NaOh (molar mass= 40 g) dissolve in water?

How many grams of glucose C6H12O6 (molar mass= 180g) must be burned to produce 180.4 KJ?

How much heat is absorbed in the formation of 1.00 mole of HI (g) from H2 (g) and I2 (g)?

give me a minute to find the answer

Explanation:

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%