<span>Kr has 8 valence electrons plus 1 for each Kr-F single bond. Total = 10 elcetrons
</span>
D is the answer its Atoms are mostly empty space with small, dense, positively charged centers.
<span><span>A.) </span>makes it possible to
calculate ΔH for complicated chemical reactions </span>
<span>
Hess’s Law makes it
possible to calculate ΔH for complicated chemical reactions. Moreover, the principle
claims that the entire amount of “enthalpy” when the development or progression
of a chemical reaction is complete whether the reactions are created in a
single or numerous processes, it still changes. This law is now described as
the principle of conservation of energy, and part of the thermodynamics law as
the first. </span>
Answer:
A reaction mechanism is the sequence of elementary steps by which a chemical reaction occurs. A reaction that occurs in two or more elementary steps is called a multistep or complex reaction. ... The slowest step in a reaction mechanism is known as the rate-determining step.