Explanation:
a brittle, High melting solid : option B (MgCl2).
1) H2S
2) H2O
3) I2
weakest to strongest.
hope this helps you.
There is an error in the first sentence of the question; the right format is:
Suppose a 500.mL flask is filled with 1.9mol of NO3 and 1.6mol of NO2.
It should be NO2 and not NO.
Answer:
The equilibrium molarity of NO = 0.21695 m
Explanation:
Given that :
the volume = 500 mL = 0.500 m
number of moles of 
number of moles of 
Then we can calculate for their respectively concentrations as :
![[NO_3] = \frac{number \ of \ moles}{volume}](https://tex.z-dn.net/?f=%5BNO_3%5D%20%3D%20%5Cfrac%7Bnumber%20%5C%20of%20%5C%20moles%7D%7Bvolume%7D)
![[NO_3] = \frac{1.9}{0.500}](https://tex.z-dn.net/?f=%5BNO_3%5D%20%3D%20%5Cfrac%7B1.9%7D%7B0.500%7D)
![[NO_3] = 3.8 \ M](https://tex.z-dn.net/?f=%5BNO_3%5D%20%3D%203.8%20%5C%20M)
![[NO_2] = \frac{number \ of \ moles}{volume}](https://tex.z-dn.net/?f=%5BNO_2%5D%20%3D%20%5Cfrac%7Bnumber%20%5C%20of%20%5C%20moles%7D%7Bvolume%7D)
![[NO_2] = \frac{}{} \frac{1.6}{0.500}](https://tex.z-dn.net/?f=%5BNO_2%5D%20%3D%20%5Cfrac%7B%7D%7B%7D%20%5Cfrac%7B1.6%7D%7B0.500%7D)
![[NO_2] = 3.2 \ M](https://tex.z-dn.net/?f=%5BNO_2%5D%20%3D%203.2%20%5C%20M)
The chemical reaction can be written as:

The ICE table is as follows;

Initial 3.8 - 3.2
Change +x x -2x
Equilibrium 3.8+x +x 3.2 - 2x
![K_c=\frac{[NO_2]^2}{[NO_3][NO]}](https://tex.z-dn.net/?f=K_c%3D%5Cfrac%7B%5BNO_2%5D%5E2%7D%7B%5BNO_3%5D%5BNO%5D%7D)



Using quadratic formula;

= 
= 0.21695 OR -3.7283
Going by the positive value;
x = 0.21695
![[NO_3] = 3.8 +x = 3.8 + 0.21695](https://tex.z-dn.net/?f=%5BNO_3%5D%20%3D%203.8%20%2Bx%20%20%3D%203.8%20%2B%200.21695)
= 4.01695 m
[NO] = x = 0.21695 m
![[NO_2] = 3.2 +x = 3.2 + 0.21695](https://tex.z-dn.net/?f=%5BNO_2%5D%20%3D%203.2%20%2Bx%20%20%3D%203.2%20%2B%200.21695)
= 3.41695 m
He was involved in the mapping of venus and mars
<span>The mass number given on
the periodic table is a weighted average of all the isotopes. You get the exact mass of
an isotope by adding the protons(atomic number) to the
number of neutrons in that isotope.</span>