Question & Answer: What is the standard molar enthalpy of combustion (in kJ middot mol^-1) of acetylene…..

What is the standard molar enthalpy of combustion (in kimol-1) of acetylene, C2H2(g)?|一C2H2(g)一一226.6 (25°C) / kJ-mol-1 | CO2(g) -393.5 H20()-285.8 B. -1192 kJ-mol C. -1299 kJ-mol- D. -2599 kJ-mol-1 A. -906 kJ-mol-1

What is the standard molar enthalpy of combustion (in kJ middot mol^-1) of acetylene, C_2H_2(g)? A. -906 kJ middot mol^-1 B. -1192 kJ middot mol^-1 C. -1299 kJ middot mol^-1 D. -2599 kJ middot mol^-1

Expert Answer

Answer

2C2H2(g) + 5O2(g) —-> 4CO2(g) + 2H2O(l)

DHrxn = (4*DH0fCO2+2*DH0fH2O) – (2*DH0fC2H2+5*DH0fO2)

= (4*-393.5+2*-285.8) – (2*226.6+5*0)

= -2599 kj/mol

answer: D

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