Ow many coulombs of charge are needed to produce 35.2 mol of solid zinc?
2 answers:
Answer:
6.79 × 10⁶ c
Explanation:
Zn can be produced from the electrolysis of an aqueous solution of a Zn salt. The reduction reaction is:
Zn²⁺(aq) + 2 e⁻ → Zn(s)
We can establish the following relations.
- 1 mol of Zn is produced when 2 moles of e⁻ are gained.
- 1 mole of e⁻ has a charge of 96468 c (Faraday's constant).
The charge needed to produce 35.2 mol of Zn is:
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Answer: The partial pressure of oxygen is 187 torr.
Explanation:
According to Raoult's law, the partial pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the total pressure.
where, x = mole fraction
= total pressure
,
,
Thus the partial pressure of oxygen is 187 torr.
Answer:
Explanation:
Using the Ideal Gas Law we have and the number of moles n could be expressed as
, where m is the mass and M is the molar mass.
Now, replacing the number of moles in the equation for the ideal gass law:
If we pass the V to divide:
As the density is expressed as , we have:
Solving for the density:
Then we need to convert the units to the S.I.:
Finally we replace the values: