When propane burns in air 526.3 kcal/mol of heat is released to the environment. How many kcal of heat are evolved?
2007-02-17 12:32:38 · 2 answers · asked by Robert H 1 in Science & Mathematics ➔ Physics
Are you sure your question is complete? You state that 526.3 kcal/mol is released (evolved). That is the energy given off for one mole. A mole is Avogadro's number of molecules. (6.02 x10 to the 23rd power) or 22.4 liters of gas at STP, or 1 gram molecular weight of the gas. Propane, C3 H8, has a molecular weight of 44 atomic mass units. So 44 grams of propane or 22.4 liters of propane, when burned in air will give off 526.3 kcal of heat.
Anyway, to answer your question, we either have to assume you are burning one mole of propane, or the question is unanswerable.
Good luck to you.
(The price of propane just went up where I live!)
2007-02-17 12:47:31 · answer #1 · answered by Spitzname 2 · 0⤊ 0⤋
This queation is definately physics. You are interested not in the compounds that are burning, but rather the friction that is evolved.
2007-02-17 20:43:24 · answer #2 · answered by kravitz44 3 · 0⤊ 0⤋