Select one:
a. S(s) + O2(g) → SO2(g) ΔH = -297kJ
b. CaCO3(s) → CaO(s) + CO2(g) ΔH = 177.7kJ
c. 2B5H9(l) + 12O2(g) → 5B2O3(s) + 9H2O(l) + 8753kJ
d. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) + 152 kJ
Which of the following represents an endothermic reaction?
2016-10-24 5:54 pm
回答 (1)
2016-10-24 6:02 pm
For the equation of an endothermic reaction, ΔH is positive or the enthalpy change is written on the reactant side of the equation.
The answer: b. CaCO₃(s) → CaO(s) + CO₂(g) …. ΔH = 177.7kJ
The answer: b. CaCO₃(s) → CaO(s) + CO₂(g) …. ΔH = 177.7kJ
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