Answer:
Tthe value of ![K_{eq}=2.31\times 10^{-3}](https://tex.z-dn.net/?f=K_%7Beq%7D%3D2.31%5Ctimes%2010%5E%7B-3%7D)
Explanation:
Initial moles of hydrogen peroxide = 1.75 mole
Volume of the container = 25 L
Concentration of a substance is calculated by:
![\text{Concentration}=\frac{\text{Number of moles}}{\text{Volume}}](https://tex.z-dn.net/?f=%5Ctext%7BConcentration%7D%3D%5Cfrac%7B%5Ctext%7BNumber%20of%20moles%7D%7D%7B%5Ctext%7BVolume%7D%7D)
So, concentration of hydrogen peroxide = ![\frac{1.75}{25 L}=0.07 M](https://tex.z-dn.net/?f=%5Cfrac%7B1.75%7D%7B25%20L%7D%3D0.07%20M)
The given chemical equation follows:
![2H_2O_2(g)\rightleftharpoons 2H_2O(g)+O_2(g)](https://tex.z-dn.net/?f=2H_2O_2%28g%29%5Crightleftharpoons%202H_2O%28g%29%2BO_2%28g%29)
Initially 0.07 M 0 0
At equilibrium
(0.07-2x) M 2x x
We are given:
Equilibrium moles of hydrogen peroxide = 1.20 mole
Equilibrium concentration of hydrogen peroxide = ![\frac{1.20}{25 L}=0.048 M](https://tex.z-dn.net/?f=%5Cfrac%7B1.20%7D%7B25%20L%7D%3D0.048%20M)
Evaluating the value of 'x', we get:
(0.07-2x) M = 0.048 M
x = 0.011 M
So, the equilibrium concentrations of water vapors and oxygen gas are:
![[H_2O]=2x=2\times 0.011 M= 0.022 M](https://tex.z-dn.net/?f=%5BH_2O%5D%3D2x%3D2%5Ctimes%200.011%20M%3D%200.022%20M)
![[O_2]=x=0.011 M](https://tex.z-dn.net/?f=%5BO_2%5D%3Dx%3D0.011%20M)
The expression of
for the above reaction follows:
![K_{eq}=\frac{[H_2O]^2\times [O_2]}{ [H_2O_2]^2}](https://tex.z-dn.net/?f=K_%7Beq%7D%3D%5Cfrac%7B%5BH_2O%5D%5E2%5Ctimes%20%5BO_2%5D%7D%7B%20%5BH_2O_2%5D%5E2%7D)
Putting values in above expression, we get:
![K_{eq}=\frac{(0.022 M)^2\times (0.011 M)}{(0.048 M)^2}\\\\K_{eq}=2.31\times 10^{-3}](https://tex.z-dn.net/?f=K_%7Beq%7D%3D%5Cfrac%7B%280.022%20M%29%5E2%5Ctimes%20%280.011%20M%29%7D%7B%280.048%20M%29%5E2%7D%5C%5C%5C%5CK_%7Beq%7D%3D2.31%5Ctimes%2010%5E%7B-3%7D)
Hence, the value of ![K_{eq}=2.31\times 10^{-3}](https://tex.z-dn.net/?f=K_%7Beq%7D%3D2.31%5Ctimes%2010%5E%7B-3%7D)
Atom is the smallest unit retaining properties of elements
Answer:
Noble gases cannot form compunds as they have completely filled orbitals and have stable noble gas configuration
Answer:
Positive
Explanation:
The nucleus of an atom has a net positive charge which is balanced by the negative charge of the electrons residing in the orbital of an atom. The reason why the nucleus of an atom is positively charged is because it contains two sub atomic particles;
The protons and neutrons. In terms of charge, the proton is positively charged and the neutron is neutral. This means the neutron does not partake in the charge of the nucleus. Hence the net charge of the nucleus is decided by the protons which are positively charged
Considering the first reaction there is no NO on the left and NO2 on the right we start with adding equation 1. To remove O3 we subtract equation 2, then here is 1/2O2 left which we remove by subtracting 1/2 equation 3.
That is; Eqn 1 - Eqn 2 - 1/2(Eqn 3)
NO(g) + O3(g) + 3/2 O2(g) + O(g) = NO2(g) + O2(g) + O3(g) + 1/2 O2(g)
This gives;
NO(g) + O(g) = NO2(g) as required, since O3(g) + 3/2O2(g) is on both sides and thus subtracts out.
Hence; ΔH = ΔH1-ΔH2-1/2 ΔH3
= (-198.9 + 142.3 - 0.5×495.0) kJ = -304.1 kJ