Atoms of an element X have the ground-state electron configuration 1s^1 2s^2 2p^

Question

Atoms of an element X have the ground-state electron configuration 1s^1 2s^2 2p^6 3s^2 3p^4. What type of ions is X most likely to form? A) X^3- B) X^6- C) X4^+ D) X^- E) X^2- Express the result of the following calculation in scientific notation: 301 cm times 439 cm A) 13.2 times 10^4 cm^2 B) 13.2 times 10^5 cm^2 C) 1.32 times 10^4 cm^2 D) 1.32 times 10^6 cm^2 E) 1.32 times 10^5 cm^2 What is Delta H degree of the following reaction? CO_2 (g) + 2CH_4 (g) rightarrow C_3 H_3 (g) + O_2 (g) Substance Delta H degree (J/mol) CO_2 (g) -393.5 CH_4 (g) -74.9 C_3 H_8 (g) -104.7 A) 348.4 kJ B) -573.1 kJ C) 438.6 kJ D) -348.4 kJ E) -648.0 kJ

Explanation / Answer

23. p can have 6 electrons. so X will likely gain 2 electrons to complete 3s^p^6

so correct choice is E) X^2-

24. 301 cm * 439 cm = 132139 cm^2

= 1.32 * 10^5 cm^2 i.e choice E) 1.32 * 10^5 cm^2

25. delta H^0 = -104.7-(-393.5-2*74.9)
= -104.7+543.3
= 438.6 kj i.e choice C) 438.6 kj

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