Calculate H rxn for the reaction of MgO(s) with HCl(g): 2 MgO(s)+ 4 HCl(g) 2 MgCl 2
Question:
Calculate ∆Hrxn for the reaction of MgO(s) with HCl(g):
2 MgO(s)+ 4 HCl(g)⟶⟶ 2 MgCl2(s) + 2 H2O(l) ∆Hrxn = ?
using the following equations: (8 pts)
Mg(s) + 2HCl(g)⟶⟶ MgCl2(s) + H2(g) ∆Hrxn = -456.9 kJ
2Mg(s) + O2(g) ⟶⟶2MgO(s) ∆Hrxn = -1203.2 kJ
2H2O(l) ⟶⟶2H2(g) + O2(g) ∆Hrxn = 571.6 kJ
Use the ΔH°f information provided to calculate ΔH°rxn for the reaction of MgO(s) with HCl(g): (6 points)
2MgO(s)+ 4HCl(g)⟶⟶ 2MgCl2(s) + 2H2O(l) ∆Hrxn = ?
ΔH°f (kJ/mol)
MgO (g) -601.6
H2O (l) -285.8
HCl(g) -92.3
MgCl2 (l) -641.3
Suppose you carry out a precipitation by mixing 35 mL of 0.25 M barium chloride solution with 25 mL of 0.20 M aluminum sulfate solution. Calculate the mass in grams of the precipitate will form from the reaction.
Chemistry The Central Science
ISBN: 978-0321696724
12th edition
Authors: Theodore Brown, Eugene LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward