Determine the missing value of ΔS⁰298 (in J/K/mol). N(g) + O(g) → NO(g)
ΔS⁰298 = ?
N2(g) + O2(g) → 2 NO(g)
ΔS⁰298 = 24.8 J/K/mol
N2(g) → 2 N(g)
ΔS⁰298 = 115.0 J/K/mol
O2(g) → 2 O(g)
ΔS⁰298 = 117.0 J/K/mol

the answer is c.the valence of the atoms combine .

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.