We are asked to calculate the heat evolved on combustion of 6 kg of each substance.
C3H4(g) + 4 O2(g) → 3 CO2(g) + 2 H2O(g).
ΔH˚rxn = –1849.5 kJ/mol
Calculate for 6 kg C3H4:
Molar mass C3H4 =40.07 g/mol
= -2.77 x 105 kJ
The heat evolved for 6 kg of C3H4 is -2.77 x 105 kJ
C3H6(g) + 9/2 O2(g) → 3 CO2(g) + 3 H2O(g).
The standard enthalpies of formation of gaseous propyne (C3H4), propylene (C3H6), and propane (C3H8) are +185.4, +20.4, and -103.8 kJ/mol, respectively.
Calculate the heat evolved on combustion of 6 kg of each substance.
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