Chemistry

Chemistry

Problem

Combustion of gaseous propane, C3H8\text{C}_3\text{H}_8, releases thermal energy according to the equation C3H8(g)+5O2(g)→3CO2(g)+4H2O(l)      ΔH=−2.22×103 kJ per mole of C3H8\text{C}_3\text{H}_8(g)+5\text{O}_2(g)\rightarrow3\text{CO}_2(g)+4\text{H}_2\text{O}(l)\;\;\;\Delta H=-2.22\times10^3\,\text{kJ}\text{ per mole of }\text{C}_3\text{H}_8 What amount of heat is released when 3.00 g3.00\,\text{g} of propane is burned completely under constant-pressure conditions? a) −2.22×102 kJ-2.22\times10^{2}\,\text{kJ} b) +1.51×102 kJ+1.51\times10^{2}\,\text{kJ} c) −1.51×102 kJ-1.51\times10^{2}\,\text{kJ} d) −7.56×102 kJ-7.56\times10^{2}\,\text{kJ}

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