Use the given heat-of-formation data to calculate the heat of reaction for each of the following. Solve each by combining the known
thermochemical equations. Verify each result
by using the general equation for finding heats
of reaction from heats of formation.
CaCO3(s) −→ CaO(s) + CO2(g)
Given:
2 CaCO3(s) −→ 2 Ca(s) + 2 C(s) + 3 O2(g)
∆H = 2459.8 kJ/mol
2 Ca(s) + O2(g) −→ 2 CaO(s)
∆H = −1269.8 kJ/mol
C(s) + O2(g) −→ CO2(g)
∆H = −393.51 kJ/mol
Answer in units of kJ/mol.