The standard enthalpy change for the reaction MgO(s) + CO₂(g) → MgCO₃(s) is measured…
CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics
Problem
The standard enthalpy change for the reaction
MgO(s) + CO₂(g) → MgCO₃(s) is measured calorimetrically to be –117 kJ mol⁻¹.
Standard enthalpies of formation at 298 K are MgO(s) = –602 kJ mol⁻¹ and CO₂(g) = –394 kJ mol⁻¹. A handbook lists ΔH°f(MgCO₃) = –1.095 × 10³ kJ mol⁻¹.
Using the experimental value above, what is the percent error in the student’s value of ΔH°f(MgCO₃) relative to the handbook?
(a) 9.2 \%
(b) 1.6 \%
(c) 3.5 \%
(d) 19.7 \%