gnmentProblemiD 935944138 offset-next previous 11 of 12 next » Part A For which

Question

gnmentProblemiD 935944138 offset-next previous 11 of 12 next » Part A For which of the following reactions is dHnn equal to 11 , of the product(s)? You do not need to look up any values to answer this question Check all that apply. the dard Hints Na(s) + Mg)-NaF(s) Na(s). F2(l)--NaF(s) 2Na(s) + F2(g)2NaF(s) ng table: SO (g) + 02 (g) SO2 (g) so3(g)-02 (g) + SO2 (g) eral reaction Submit My Answers Give Up (reactants) 0.2) + Part B The combustion of pentane, CHi, occurs via the reaction Clla (g) + 802(x)-500, (g) + 6H20(g) with heat of formation values given by the following table Substance.A

Explanation / Answer

Answer

Na(s) + 1/2 F2(s) -------> NaF(s)

2Na(s) + F2(g) --------> 2NaF(s)

S(s) + O2(g) --------> SO2(g)

SO(g) + 1/2O2(g) -------> SO2(g)

Explanation

Standard free energy of formation(H°f) for elements in their standard states is zero

H°rxn = H°f(products) - H°f(reactants)

Therefore,

For reactions which involve only elements in their standard state as reactants , H°f is zero.

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