7. \"Gasohol\" a mixture of gasoline and ethanol, C,H,OH, is used as automobile

Question

7. "Gasohol" a mixture of gasoline and ethanol, C,H,OH, is used as automobile fuel. The alcohol releases energy in a combustion reaction with O2- C2H5OH() 302(g) + 2CO2(g) + 3H20(1) If 0.115 g of alcohol evolves 3.62 kJ when burned at constant pressure, what is the molar enthalpy of combustion for ethanol? 8. Methanol is a clean-burning fuel that has been proposed as a replacement for gasoline. Suppose it could be produced from the reaction of oxygen in air with methane (CH). Find the standard enthalpy of reaction for the formation of lmol of methanol (CH3OH) from methane and oxygen, given the following information: CH4(g) + H2O(g) CO(g) + 3H2(g) 2H2(g) + cos) CH3OH(1) 2H2(g) + O2 2H2O(g) dHnn: +206. 10KJ AF Inn-48364KJ

Explanation / Answer

7)

Molar mass of C2H5OH,
MM = 2*MM(C) + 6*MM(H) + 1*MM(O)
= 2*12.01 + 6*1.008 + 1*16.0
= 46.068 g/mol


mass(C2H5OH)= 0.115 g

number of mol of C2H5OH,
n = mass of C2H5OH/molar mass of C2H5OH
=(0.115 g)/(46.068 g/mol)
= 2.496*10^-3 mol

SO,
2.496*10^-3 mol evolves 3.62 KJ

delta H = -3.62 KJ / (2.496*10^-3 mol)
= -1450 KJ/mol

Answer: -1450 KJ/mol

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