Since atomic mass is protons + neutrons, if you subtract atomic mass - protons, you get neutrons.
Answer:
Because frequency and wavelength are related by a constant (c) the energy can also be written in terms of wavelength: E = h · c / λ.
Answer:
The reaction quotient (Q) before the reaction is 0.32
Explanation:
Being the reaction:
aA + bB ⇔ cC + dD
![Q=\frac{[C]^{c} *[D]^{d} }{[A]^{a}*[B]^{b} }](https://tex.z-dn.net/?f=Q%3D%5Cfrac%7B%5BC%5D%5E%7Bc%7D%20%2A%5BD%5D%5E%7Bd%7D%20%7D%7B%5BA%5D%5E%7Ba%7D%2A%5BB%5D%5E%7Bb%7D%20%20%7D)
where Q is the so-called reaction quotient and the concentrations expressed in it are not those of the equilibrium but those of the different reagents and products at a certain instant of the reaction.
The concentration will be calculated by:
![Concentration=\frac{number of moles of solute}{Volume}](https://tex.z-dn.net/?f=Concentration%3D%5Cfrac%7Bnumber%20of%20moles%20of%20solute%7D%7BVolume%7D)
You know the reaction:
PCl₅ (g) ⇌ PCl₃(g) + Cl₂(g).
So:
![Q=\frac{[PCl_{3} ] *[Cl_{2} ] }{[PCl_{5} ]}](https://tex.z-dn.net/?f=Q%3D%5Cfrac%7B%5BPCl_%7B3%7D%20%5D%20%2A%5BCl_%7B2%7D%20%5D%20%7D%7B%5BPCl_%7B5%7D%20%5D%7D)
The concentrations are:
- [PCl₃]=
![\frac{0.04 moles}{0.5 L} =0.08 \frac{moles}{L}](https://tex.z-dn.net/?f=%5Cfrac%7B0.04%20moles%7D%7B0.5%20L%7D%20%3D0.08%20%5Cfrac%7Bmoles%7D%7BL%7D)
- [Cl₂]=
![\frac{0.08 moles}{0.5 L} =0.16 \frac{moles}{L}](https://tex.z-dn.net/?f=%5Cfrac%7B0.08%20moles%7D%7B0.5%20L%7D%20%3D0.16%20%5Cfrac%7Bmoles%7D%7BL%7D)
- [PCl₅]=
![\frac{0.02 moles}{0.5 L} =0.04 \frac{moles}{L}](https://tex.z-dn.net/?f=%5Cfrac%7B0.02%20moles%7D%7B0.5%20L%7D%20%3D0.04%20%5Cfrac%7Bmoles%7D%7BL%7D)
Replacing:
![Q=\frac{0.08*0.16}{0.04}](https://tex.z-dn.net/?f=Q%3D%5Cfrac%7B0.08%2A0.16%7D%7B0.04%7D)
Solving:
Q= 0.32
<u><em>The reaction quotient (Q) before the reaction is 0.32</em></u>