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anap Chrome File Edit View History Bookmarks Window People Help Bb MyPsychLab g-2 x HW11 due Apr 6 015 C D ezto.mheducation.com Ihm.tpx CHM 11600 Sp2015: 11600A (10:30 or 11:30 CHEMISTRY AM lecture) Hw11 due Apr 6 next prev Question #6 (of 14) value: 0.71 points Ch. Ex. 80 Heats of Reaction from Heats of Formation cp80 1 out of 3 attempts Net Calculator Enter your answer in the provided box. Assistance Acetylene burns in air according to the following equation: Check My Work C2H2(g) AH 1255.8 kJ View Hint View Qu Given AHo, of Co20g 393.5 kJ/mol and AHO. of 200g 241.8 kJ/mol, find AH Pint of C2H2(g). Question Help Report a Problem kJ/mol references book & resources Patricia Regan save & exit Sun Apr 5 1 09 PM (29%) instructions l help submit assignment nd EN TB On On On

Explanation / Answer

?Hf = H products - H reactants

?Hf = -1255.8 kJ/mol

H products = 2xHfCO2 + 1xHfH2O

H Reactants = 1xHfC2H2 +1xHfO2

NOTE that Hf O2 = 0 for being elemental structure

HfCO2 = -393.5 kJ/mol

HfH2O = -241.8 kJ/mol

HfC2H2 = we are looking for this

Hrxn = -1255.8 kJ/mol

Hrxn = 2xHfCO2 + 1xHfH2O -(1xHfC2H2 +1xHfO2)

-1255.8 = 2*-393.5 + -241.5 - (HfC2H2)

HfC2H2 = 227 kJ/mol

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