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2. A propane grill is used to cook ribeye steak and potatoes. About 0.470 L of propane (C3H8) is combusted over the course of about 30 min, a typical grilling season time. How much energy (in kJ) was released from the combustion of this amount of propane? (dC3H8 = 0.493 g cm^-3) C3H8(g) + 5O2(g) → 3CO(g) + 4H2O(l) ΔH = -2.22 X 10^3 kJ mol^-1