Hess law can help us to obtain the enthalpy of a series of reactions by summation. The missing enthalpy of this reaction is −198kJ.
<h3>
What is Hess law?</h3>
According to the Hess law of constant heat summation, the enthalpy of a sequence of reactions can be obtained as the sum of the enthalpies of all the reactions.
Now looking at all the reavtion written here in order to obtain the missing enthalpy, we conclude that the missing enthalpy is −198kJ.
Learn more about enthalpy: brainly.com/question/3393755
Actually the third
shall is composed of 1 s orbital, 3 p orbitals, and 5 d orbitals. Each of these
orbital holds 2 electrons therefore the total number of electrons are:
(1 + 3 + 5) * 2 = 18
<span>There are 18 electrons
that can fall in the 3rd shell. And there are 9 orbitals.</span>
Mass = 760 g
Volume = 84 cm³
density = mass / volume
d = 760 / 84
d = 9.04 g/cm³
hope this helps!