Zn⁰ ----> Zn⁺² + 2e⁻ - oxidation
Hg⁺² + 2e⁻ ----> Hg⁰ - reduction
Zn loses 2 moles of electrons , and Hg gains 2 mole of electrons.
So, number of moles of electrons gained and lost during reaction is equal.
Hello!
To find the number of moles that are in the given amount, we need to divide the total number of atoms by Avogadro's number, which is 1 mole is equal to 6.02 x 10^23 atoms.
5.0 x 10^25 / 6.02 x 10^23 ≈ 83.0564
Therefore, there are about 83.06 moles of iron (sigfig: 83 moles).
Answer:
The catalyzed reaction will take 2.85 seconds to occur.
Explanation:
The activation energy of a reaction is given by:
![k = Ae^{-\frac{E_{a}}{RT}}](https://tex.z-dn.net/?f=%20k%20%3D%20Ae%5E%7B-%5Cfrac%7BE_%7Ba%7D%7D%7BRT%7D%7D%20)
For the reaction without catalyst we have:
(1)
And for the reaction with the catalyst:
(2)
Assuming that frequency factor (A) and the temperature (T) are constant, by dividing equation (1) with equation (2) we have:
![\frac{k_{1}}{k_{2}} = \frac{Ae^{-\frac{E_{a_{1}}}{RT}}}{Ae^{-\frac{E_{a_{2}}}{RT}}}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bk_%7B1%7D%7D%7Bk_%7B2%7D%7D%20%3D%20%5Cfrac%7BAe%5E%7B-%5Cfrac%7BE_%7Ba_%7B1%7D%7D%7D%7BRT%7D%7D%7D%7BAe%5E%7B-%5Cfrac%7BE_%7Ba_%7B2%7D%7D%7D%7BRT%7D%7D%7D%20)
Since the reaction rate is related to the time as follow:
![k = \frac{\Delta [R]}{t}](https://tex.z-dn.net/?f=%20k%20%3D%20%5Cfrac%7B%5CDelta%20%5BR%5D%7D%7Bt%7D%20)
And assuming that the initial concentrations ([R]) are the same, we have:
![\frac{k_{1}}{k_{2}} = \frac{\Delta [R]/t_{1}}{\Delta [R]/t_{2}}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bk_%7B1%7D%7D%7Bk_%7B2%7D%7D%20%3D%20%5Cfrac%7B%5CDelta%20%5BR%5D%2Ft_%7B1%7D%7D%7B%5CDelta%20%5BR%5D%2Ft_%7B2%7D%7D%20)
![\frac{k_{1}}{k_{2}} = \frac{t_{2}}{t_{1}}](https://tex.z-dn.net/?f=%5Cfrac%7Bk_%7B1%7D%7D%7Bk_%7B2%7D%7D%20%3D%20%5Cfrac%7Bt_%7B2%7D%7D%7Bt_%7B1%7D%7D)
![t_{2} = t_{1}\frac{k_{1}}{k_{2}} = 6900 y*1.31 \cdot 10^{-11} = 9.04 \cdot 10^{-8} y*\frac{365 d}{1 y}*\frac{24 h}{1 d}*\frac{3600 s}{1 h} = 2.85 s](https://tex.z-dn.net/?f=%20t_%7B2%7D%20%3D%20t_%7B1%7D%5Cfrac%7Bk_%7B1%7D%7D%7Bk_%7B2%7D%7D%20%3D%206900%20y%2A1.31%20%5Ccdot%2010%5E%7B-11%7D%20%3D%209.04%20%5Ccdot%2010%5E%7B-8%7D%20y%2A%5Cfrac%7B365%20d%7D%7B1%20y%7D%2A%5Cfrac%7B24%20h%7D%7B1%20d%7D%2A%5Cfrac%7B3600%20s%7D%7B1%20h%7D%20%3D%202.85%20s%20)
Therefore, the catalyzed reaction will take 2.85 seconds to occur.
I hope it helps you!
Answer:
Alkanes
Explanation:
Alkanes are hydrocarbons containing only single bonds between the parent chain carbons.
Alkenes are hydrocarbons containing at least one double bond between the parent chain carbons.
Alkynes are hydrocarbons containing at least one triple bond between the parent chain carbons.
Answer:
B
Explanation:
Since ice is less dense than water, it floats. This forms an ice cover sheet in cold regions such as in the poles. This insulates the water beneath from excessive heat loss hence preventing it from turning into ice too, This protects the marine life beneath. Also, water does not gain heat or loss it rapidly (due to its high heat capacity) hence offering a more or stable temperature range for marine life.