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Stoichiometry: Real World Reactions

Problems

Energy Changes

Heat of Reaction

Problem : CaCO3(s) + 176 kJ→CaO(s) + CO2(g)

How much energy is required to decompose 10.4 moles of CaCO3(s) ?

10.4 moles×176 kJ / mole = 1830 kJ

Problem : SO3(g) + H2O(l)→H2SO4(aq) +  129.6 kJ

At STP, if 540 kJ is released, what volume of SO3(g) was originally added?


= 4.17 moles SO3(g)  
= 93.3 L  

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