According to its correct Lewis structure, which molecule contains a triple bond?

Question

According to its correct Lewis structure, which molecule contains a triple bond? A. N_2 B. O_2 C. C_2 H_4 D. CF_4 E. H_2 O According to its correct Lewis structure, which molecule is a polar molecule? A. SO_3 B. PCl_5 C. CO_2 D. SO_2 E. CF_4 Thermochemistry Determine the heat given off to the surroundings when 9.0 g of aluminum reacts according to the equation 2 Al + Fe_2 O_3 rightarrow Al_2 O_3 + 2 Fe, delta H degree _rxn = -849 kJ. A) 1.4 times 10^2 kJ B) 2.8 times 10^2 kJ C) 5.6 times 10^2 kJ D) 2.5 times 10^3 kJ E) 7.6 times 10^3 kJ

Explanation / Answer

6) option A

From the proper Lewis structures N2 is the molecule with a triple bond.

7) option D

SO2 is the molecule which is polar as it is the only non-symmetric molecule in the given structures.

8) 2Al + Fe2O3 -------> Al2O3 + 2Fe deltaH = -849kJ

from the equation 2 x27 g Of Al reacts to give 849 kJ

If 9 g of Al of Al gives = 9x 849 /2x27

= -141.5 kJ

= -1.41 x102 kJ

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