[Answer] Part AFor which one of the following reactions is the value of ΔH°rxn equal to ΔH°f for the product? 1/2N2(g) + O2(g) → NO2(g) H2(g) + 1/2O2(g) → H2O(l) 2C(s graphite) + 2H2(g) → C2H4(g) H2(g) + O2(g) → H2O2(l) all of the above

Answer: Chem Test 2

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Part AFor which one of the following reactions is the value of ΔH°rxn equal to ΔH°f for the product? 1/2N2(g) + O2(g) → NO2(g) H2(g) + 1/2O2(g) → H2O(l) 2C(s graphite) + 2H2(g) → C2H4(g) H2(g) + O2(g) → H2O2(l) all of the above Sat Jul 21 2012 · It seems to me that both C) and D) are viable. In C) the reactants ( H2O ( l ) and O2 ( g ) are in their standard states at 25 C and 1 atm P and thus have ΔH°f values of zero. Also there is one mole of product ( H2O2 ( l )) which is also in its standard state. The same reasoning goes for D). Part AFor which one of the following reactions is the value of ΔH°rxn equal to ΔH°f for the product? 1/2N2(g) + O2(g) → NO2(g) H2(g) + 1/2O2(g) → H2O(l) 2C(s graphite) + 2H2(g) → C2H4(g) H2(g) + O2(g) → H2O2(l) all of the above Sat Jul 21 2012 · … The reaction D has the value of ΔH°rxn equal to ΔH°f for the product . Explanation: The ΔH°f for product is equal to ΔH°rxn when the reagents are in their elemental state ( ΔH°f = 0) and form one mole of product . We have to find the reagents that are in their elemental state and that only form one mole of product : A) 2Ca ( s ) + O₂ ( g ... For which one of the following reactions is the value of ΔH°rxn equal to ΔHf° for the product ? A) C (diamond) + O2 ( g ) → CO2 ( g ) B) 2Ca ( s ) + O2 ( g ) → 2CaO ( s ) C)C2H2( g ) + H2 ( g ) → C2H4 ( g ) D) 2C ( graphite ) + O2 ( g ) → 2CO ( g ) E) 3Mg ( s ) + N2 ( g ) → Mg3N2 ( s ) Example: The oxidation of ammonia is given by the following reaction: 4 NH3 ( g ) + 5 O2 ( g ) → 4 NO ( g ) + 6 H2O ( g ) Calculate the Horxn if the Hof value...

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