Propane, C3H8, is used in many instances to produce heat by burning: C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g) The standard enthalpy of reaction, ΔHrxn, is −2,044 kJ. ΔHrxn is a symbol or the heat of reaction. 1. How many grams of oxygen would be needed to produce 396.0 kJ of heat?
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