How much heat is absorbed when 18.3g of KCl decomposes to K and Cl2 Show the conversions required to solve this problem.

Question

How much heat is absorbed when 18.3g of  KCl decomposes to K and Cl₂ Show the conversions required to solve this problem.

2KCl(s) --> 2K(s) +Cl₂(g) Δ𝐻=873 kJ

18.3 g KCl x(--------) x(---------) = ________

Answer Bank

70.90 mol Cl₂ 39.10 g K 2 mol KCl 1 mol K

2 mol K 74.55 g KCl 1 mol Cl₂ 1 mol KCl

873 kJ

Answer 1

2KCl(s) --> 2K(s) +Cl₂(g) Δ𝐻=873 kJ

18.3 g KCl x 1 mol KCl / 74.55 g x 873 kJ / 2 mol KCl = 214 kJ