For the hypothetical reaction 3X2 (g) --> 2X3(g), H = -333 KJ and the atomic wei

Question

For the hypothetical reaction 3X2 (g) --> 2X3(g), H = -333 KJ and the atomic weight of X is 66.6 amu. H for theconversion of 11.1 g of X3 into X2 in KJ is:
a) -2 KJ b) +2 KJ c) -333 KJ d) +9.25 KJ e) -9.25 KJ
a) -2 KJ b) +2 KJ c) -333 KJ d) +9.25 KJ e) -9.25 KJ

Explanation / Answer

3X2 (g) --> 2X3 (g), H = -333KJ atomic weight of X is 66.6amu gram atomic weight of X is 66.6 g             3X2 (g) --> 2X3 (g), H = -333 KJ let us reverse the reaction             2X3----->3X2         H= +333 kj this means 2X3X66.6 grams of X3 giving 3X2X66.6 gof X2 (same) by taking 333 kj                  399.6   grams ofX3 taking 333kj                   11.1    grams of X3taking ?            =[333/399.6] *11.1 kj= + 9.25kj    d) +9.25 KJ

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