2. Propane, C3Hs(g), reacts with oxygen gas to produce carbon dioxide gas and wa

Question

2. Propane, C3Hs(g), reacts with oxygen gas to produce carbon dioxide gas and water vapor. a) Write a balanced equation including states of matter for the reaction b) If 4.55 g of propane reacts with excess oxygen under standard conditions, calculate the theoretical yields (in grams) for both carbon dioxide and water, and » » the total amount of heat released/absorbed when the reaction is complete c) Ethanol is currently being used as a replenishable fuel alternative/supplement because it can be produced from plants. Calculate the total amount of heat absorbed/released from the combustion of (a) one mole of gaseous ethanol (C2HsOH) and (b) one mole of gaseous propane. Assume that carbon dioxide and water are the only products for each reaction. Show all of your work, including the balanced chemical equation for the combustion of ethanol and units in calculations. Based on your calculations, describe how ethanol compares to propane as an energy source. Standard Thermodynamic Values at 298 K Substance CO2 C2HsOH C3Hs H2O (kJ/mol -393.5 235.1 105 241.826

Explanation / Answer

Ans. Balanced chemical equation:-

(a) C3H8 + 5 O2 = 3 CO2 + 4 H2O

44g 3 * 44g 4 * 18 g

(b) 44 g C3H8 produces 132 g of CO2

and hence 4.55 g propane produces 132 * 4.55 / 44 = 13.65 g of CO2

and 4.55 g propane produces = (4 * 18 * 4.55 / 44 ) = 7.44 g of H2O

for 44g of propance, delta H combustion = 2220 KJ

for 4.55 g of propane delta H combustion = 2220 * 4.55 / 44 = 229.5 KJ of heat is released

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