6. The heats of formation of CO2(g)...
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6. The heats of formation of CO2(g) and H2O(l) are -394 kJ/mole and -285.8 kJ/mole respectively & AH combustion (C3H3(g)] =-2221.6 kJ. Then calculate the heat of formation of C3H3(g). (A) 212.2 kJ (B) - 143.3 kJ (C) 185.4 kJ (D) – 103.6 kJ

JEE/Engineering Exams
Chemistry
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[ C_{3} H_{8}+50_{2} longrightarrow 3 C O_{2}+4 H_{2} O ] heat [ begin{array}{l} text { it of formation }=30 mathrm{co}_{2}+4 mathrm{DH}_{2} mathrm{O}-Delta mathrm{C}_{3} mathrm{H}_{8} =3(-394)+4(-288.8)+2221.6 =-1189 mathrm{d}-1143.2+2221.6 =-103.6 mathrm{kJ} end{array} ]
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