Answer:
[H₂] = 1.61x10⁻³ M
Explanation:
2H₂S(g) ⇋ 2H₂(g) + S₂(g)
Kc = 9.30x10⁻⁸ = ![\frac{[H_{2}]^2[S_{2}]}{[H_{2}S]^2}](https://tex.z-dn.net/?f=%5Cfrac%7B%5BH_%7B2%7D%5D%5E2%5BS_%7B2%7D%5D%7D%7B%5BH_%7B2%7DS%5D%5E2%7D)
First we <u>calculate the initial concentration</u>:
0.45 molH₂S / 3.0L = 0.15 M
The concentrations at equilibrium would be:
[H₂S] = 0.15 - 2x
[H₂] = 2x
[S₂] = x
We <u>put the data in the Kc expression and solve for x</u>:
We make a simplification because x<<< 0.0225:
x = 8.058x10⁻⁴
[H₂] = 2*x = 1.61x10⁻³ M
Avagadros number is where 1 mol of any substance is made of 6.022 x 10²³ units. These units could be atoms making up an element of molecules making up a compound.
1 mol of Br₂ is made of 6.022 x 10²³ molecules of Br₂
the flask contains 0.100 mol
Therefore if 1 mol has 6.022 x 10²³ molecules of Br₂
then 0.1 mol has - 6.022 x 10²³ molecules/mol x 0.1 mol
therefore number of molecules - 6.022 x 10²² Br₂ molecules ₂
The event that is known to have 'created' the universe was the Big Bang THEORY (because it can't be proven and most people just don't want to admit that there is a God)
Answer:
-26.6kJ/mol
Explanation:
The dissolution of NH₄NO₃ is:
NH₄NO₃(aq) → NH₄⁺(aq) + NO₃⁻(aq)
To solve this question we need to find the heat released in the dissolution using the equation of coffee cup calorimeter:
Q = -m*S*ΔT
<em>Where Q is heat,</em>
<em>m is the mass of solution = 1.60g + 75.0g = 76.6g</em>
<em>S is specific heat of the calorimeter (4.18J/g°C)</em>
<em>And ΔT is change in temperature (25°C - 23.34°C = 1.66°C)</em>
<em />
The heat is:
Q = -76.6g*4.18J/g°C*1.66°C
Q = -531.5J = -0.5315kJ are released
The heat released per mole = Enthalpy for the dissolution is:
<em>Moles NH₄NO₃:</em>
1.60g * (1mol / 80.043g) = 0.0200mol
Enthalpy for the dissolution:
-0.5315kJ / 0.0200mol =
<h3>-26.6kJ/mol</h3>
