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How much heat (in {kJ}) evolves when 7.0L of C2H2(d = 1.0967kg/m^3) is mixed with a stoichiometric amount of oxygen gas? The combustion reaction is
C2H2+ 5/2 O2-> 2 CO2+ H2O,
Delta H=-1299.5 kJ

• chem -

Convert 7.0 L to grams. Use density to do that.
Then dH rxn = 1299.5 kJ x (mass C2H2/molar mass C2H2) = ?

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