It’s 7 in that’s the only answer that makes sense
Answer:
- 27
Step-by-step explanation:
Evaluate from the ' inside out ' , that is
Evaluate g(2) then use this value to evaluate f(x) then use this value to evaluate h(x)
g(2) = 4(2)² - 9 = 4(4) - 9 = 16 - 9 = 7, then
f(7) = 7 + 7 = 14 , then
h(14) = - 2(14) + 1 = - 28 + 1 = - 27
As the given values are
<span>ΔHf° = –423 kJ/mol
</span>ΔHsub = 119 kJ/mol
IE = 469 kJ/mol
ΔHEA = –301 kJ/mol
BE = 161 kJ/mol
The lattice energy of the compound can be determined by applying formula
U = <span>ΔHf° - </span>ΔHsub - BE - IE - ΔHEA
by putting values
U = -423 - 119 - 161 - 469 - (-301)
solving further
U = -871 kJ/mol
so the lattice energy is 871 kJ/mol
hope it helps
