What do you need help with exactly can you explain ? I think I understand what you mean cause I just had this assignment in chemistry
Compression and rarefaction. However instead of crests and troughs, longitudinal waves have compressions and rarefactions. A compression is a region in a longitudinal wave where the particles are closest together. A rarefaction is a region in a longitudinal wave where the particles are furthest apart.
Answer:
The reactions free energy 
Explanation:
From the question we are told that
The pressure of (NO) is 
The pressure of (Cl) gas is 
The pressure of nitrosly chloride (NOCl) is 
The reaction is
⇆ 
From the reaction we can mathematically evaluate the
(Standard state free energy ) as

The Standard state free energy for NO is constant with a value

The Standard state free energy for
is constant with a value

The Standard state free energy for
is constant with a value

Now substituting this into the equation

The pressure constant is evaluated as

Substituting values


The free energy for this reaction is evaluated as

Where R is gas constant with a value of 
T is temperature in K with a given value of 
Substituting value
![\Delta G = -43 *10^{3} + 8.314 *298 * ln [0.0765]](https://tex.z-dn.net/?f=%5CDelta%20%20G%20%20%3D%20-43%20%2A10%5E%7B3%7D%20%2B%208.314%20%2A298%20%2A%20ln%20%5B0.0765%5D)


0.000003721
...........................
...........................
V ( NaOH ) = 25 mL in liters : 25 / 1000 => 0.025 L
M ( NaOH ) = 0.160 M
V ( H2SO4) = 17 mL / 1000 => 0.017 L
M ( H2SO4) = ?
number of moles NaOH:
n = M x V = 0.160 x 0.025 => 0.004 moles NaOH
Mole ratio :
<span>2 NaOH + H2SO4 = Na2SO4 + 2 H2O
</span>
2 moles NaOH ----------- 1 mole H2SO4
0.004 moles NaOH ----- ? moles H2SO4
moles H2SO4 = 0.004 x 1 / 2
= 0.002 moles of H2SO4
M ( H2SO4) = n / V
M = 0.002 / 0.017
= 0.117 M H2SO4
Answer B
hope this helps!