option A.
The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized
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whenever you have problem for ph and poh just make this table and go from there .
Ph = 14 - Poh
Poh = 14- Ph
Answer is: 33,6 liters of water vapor.
Chemical reaction: CH₄ + 2O₂ → CO₂ + 2H₂O.
m(CH₄) = 12 g.
n(CH₄) = m(CH₄) ÷ M(CH₄)
n(CH₄) = 12 g ÷ 16 g/mol = 0,75 mol
from reaction: n(CH₄) : n(H₂O) = 1 : 2
n(H₂O) = 1,5 mol.
V(H₂O) = n(H₂O) · Vm
V(H₂O) = 1,5 mol · 22,4 mol/dm³
V(H₂O) = 33,6 dm³.
1 miles = 1609.344 m
1 hour = 60 min x 60 sec = 3600 s
30 miles 1 hr 1609.344 m
_______ x ______ x __________= 13.412m/s
1 hr 3600 s 1 miles
<u>Answer:</u> The equilibrium constant for the total reaction is 
<u>Explanation:</u>
We are given:

We are given two intermediate equations:
<u>Equation 1:</u> 
The expression of
for the above equation is:
![K_{c_1}=\frac{[NH_3]^2}{[N_2][H_2]^3}](https://tex.z-dn.net/?f=K_%7Bc_1%7D%3D%5Cfrac%7B%5BNH_3%5D%5E2%7D%7B%5BN_2%5D%5BH_2%5D%5E3%7D)
.......(1)
<u>Equation 2:</u> 
The expression of
for the above equation is:
![K_{c_2}=\frac{[HI]^2}{[H_2][I_2]}](https://tex.z-dn.net/?f=K_%7Bc_2%7D%3D%5Cfrac%7B%5BHI%5D%5E2%7D%7B%5BH_2%5D%5BI_2%5D%7D)
......(2)
Cubing both the sides of equation 2, because we need 3 moles of HI in the main expression if equilibrium constant.
![(41)^3=\frac{[HI]^6}{[H_2]^3[I_2]^3}](https://tex.z-dn.net/?f=%2841%29%5E3%3D%5Cfrac%7B%5BHI%5D%5E6%7D%7B%5BH_2%5D%5E3%5BI_2%5D%5E3%7D)
Now, dividing expression 1 by expression 2, we get:
![\frac{K_{c_1}}{K_{c_2}}=\left(\frac{\frac{[NH_3]^2}{[N_2][H_2]^3}}{\frac{[HI]^6}{[H_2]^3[l_2]^3}}\right)\\\\\\\frac{0.282}{68921}=\frac{[NH_3]^2[I_2]^3}{[N_2][HI]^6}](https://tex.z-dn.net/?f=%5Cfrac%7BK_%7Bc_1%7D%7D%7BK_%7Bc_2%7D%7D%3D%5Cleft%28%5Cfrac%7B%5Cfrac%7B%5BNH_3%5D%5E2%7D%7B%5BN_2%5D%5BH_2%5D%5E3%7D%7D%7B%5Cfrac%7B%5BHI%5D%5E6%7D%7B%5BH_2%5D%5E3%5Bl_2%5D%5E3%7D%7D%5Cright%29%5C%5C%5C%5C%5C%5C%5Cfrac%7B0.282%7D%7B68921%7D%3D%5Cfrac%7B%5BNH_3%5D%5E2%5BI_2%5D%5E3%7D%7B%5BN_2%5D%5BHI%5D%5E6%7D)
![\frac{[NH_3]^2[I_2]^3}{[N_2][HI]^6}=4.09\times 10^{-6}](https://tex.z-dn.net/?f=%5Cfrac%7B%5BNH_3%5D%5E2%5BI_2%5D%5E3%7D%7B%5BN_2%5D%5BHI%5D%5E6%7D%3D4.09%5Ctimes%2010%5E%7B-6%7D)
The above expression is the expression for equilibrium constant of the total equation, which is:

Hence, the equilibrium constant for the total reaction is 