Question

6) Naphthalene (CoHs; MM-128.2g/mol) is a solid aromatic compound often sold as mothballs. The complete combustion of naphthalene into CO:(g) and H2O () at 25 °C produces 5154 kJ/mol of heat A) Write a balanced chemical equation for the complete combustion of naphthalene. B) When 55.5 grams of naphthalene undergoes combustion with 4mol O, how much heat is produced? (Consider the sign of the enthalphy.) C) Write a balanced chemical equation for the formation of naphthalene (CoHs) from its elements D) Calculate the standard enthalpy of formation of naphthalene. (AH values for CO2 and H2O are -395 kJ/mol and -286 kJ/mol, respectively.)

Answer 1

A 10 Mg16) + 120218) 10 coolg) + 4H2011) AMUSISI KJ molt metep of como a mass = SS.5g, = 0.433 maj molarmas 128gmar) ③ for 1 met ; oM= - SIST KJ fear 0.433 md ; AM= - SIST KJ X 0 433 met Imel OH = q = - 2.234.7 KJ lansual © 10 cl graphite s) + 4H2(g) → COM&/s) mer 6 GOHEIS) + 120218) - 10002 (9) + 4H204) A4 = - SISEKS, Sho- loxant Co2(a) + 4 x Ant Hold) - antCOMBIS) + 12XAM & O2(g) - - SIST KJ mort = 10x -395 kJ mart + ex-286 kimarl - GHI COMBI - +1240 - S154 kJ mors = – 3950 kJ mert - 1144 Ksmert - also sht 10H8/S) = -60 kJ mert (avowei).