Click on the Delta H changes sign whan a process is reversed button within the activity and analyze the relationship between the
1 answer:
You might be interested in
Answer : The value of final volume, temperature and the work done is, 8.47 L, 258 K and -873.6 J
Explanation :
First we have to calculate the value of .
As,
So,
Given :
Now we have to calculate the initial volume of gas.
Formula used :
where,
= initial pressure of gas = 4.25 atm
= initial volume of gas = ?
= initial temperature of gas = 300 K
n = number of moles of gas = 1.0 mol
R = gas constant = 0.0821 L.atm/mol.K
Now we have to calculate the final volume of gas by using reversible adiabatic expansion.
where,
= initial pressure of gas = 4.25 atm
= final pressure of gas = 2.50 atm
= initial volume of gas = 5.80 L
= final volume of gas = ?
= 1.4
Now put all the given values in above formula, we get:
Now we have to calculate the final temperature of gas.
Formula used :
where,
= final pressure of gas = 2.50 atm
= final volume of gas = 8.47 L
= final temperature of gas = ?
n = number of moles of gas = 1.0 mol
R = gas constant = 0.0821 L.atm/mol.K
Now put all the given values in above formula, we get:
Now we have to calculate the work done.
where,
w = work done = ?
n = number of moles of gas =1.0 mol
= initial temperature of gas = 300 K
= final temperature of gas = 258 K
Now put all the given values in above formula, we get:
Therefore, the value of final volume, temperature and the work done is, 8.47 L, 258 K and -873.6 J
Answer:
0.3023 M
Explanation:
Let Picric acid =
So, +
⇄
+
The ICE table can be given as:
+
⇄
+
Initial: 0.52 0 0
Change: - x + x + x
Equilibrium: 0.52 - x + x + x
Given that;
acid dissociation constant () = 0.42
0.42(0.52-x) = x²
0.2184 - 0.42x = x²
x² + 0.42x - 0.2184 = 0 -------------------- (quadratic equation)
Using the quadratic formula;
; ( where +/- represent ± )
=
=
= OR
= OR
= OR
= 0.30225 OR - 0.72225
So, we go by the +ve integer that says:
x = 0.30225
x = [ ] = [
] = 0.3023 M
∴ the value of [H3O+] for an 0.52 M solution of picric acid = 0.3023 M (to 4 decimal places).