Answer:
2 electrons are transfered in this reaction.
Explanation:
Oxidation is a reaction where an atom, ion, or molecule loses electrons, while reduction corresponds to the electron gain of an atom, ion, or molecule.
In an oxidation-reduction reaction two simultaneous processes take place, oxidation and reduction.
So, oxidation-reduction (redox) reactions involve the transfer of electrons between chemical species. They are also called electron transfer reactions since the particle that is exchanged is the electron.
In this case:
Zn(s) ⇒ Zn²⁺(aq) + 2 e⁻
2 Ag⁺ (aq) + 2 e⁻ ⇒ 2 Ag(s)
So, zinc metal loses two electrons to form the zinc(II) ions, while the two silver ions each gain one electron to form two silver metal atoms.
Then, Zn is a reducing agent (The reducing agent is the one that provides the electrons, oxidizing itself), AgNO3 is an oxidizing agent (The oxidizing agent is the one that traps the electrons, reducing itself).
Finally, you can see that <u><em>2 electrons are transfered in this reaction.</em></u>
<u>Answer:</u> The mass of sodium acetate that must be added is 30.23 grams
<u>Explanation:</u>
To calculate the number of moles for given molarity, we use the equation:
Molarity of acetic acid solution = 0.200 M
Volume of solution = 1 L
Putting values in above equation, we get:
To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:
![pH=pK_a+\log(\frac{[\text{salt}]}{[\text{acid}]})](https://tex.z-dn.net/?f=pH%3DpK_a%2B%5Clog%28%5Cfrac%7B%5B%5Ctext%7Bsalt%7D%5D%7D%7B%5B%5Ctext%7Bacid%7D%5D%7D%29)
![pH=pK_a+\log(\frac{[CH_3COONa]}{[CH_3COOH]})](https://tex.z-dn.net/?f=pH%3DpK_a%2B%5Clog%28%5Cfrac%7B%5BCH_3COONa%5D%7D%7B%5BCH_3COOH%5D%7D%29)
We are given:
= negative logarithm of acid dissociation constant of acetic acid = 4.74
![[CH_3COONa]=?mol](https://tex.z-dn.net/?f=%5BCH_3COONa%5D%3D%3Fmol)
![[CH_3COOH]=0.200mol](https://tex.z-dn.net/?f=%5BCH_3COOH%5D%3D0.200mol)
pH = 5.00
Putting values in above equation, we get:
![5=4.74+\log(\frac{[CH_3COONa]}{0.200})](https://tex.z-dn.net/?f=5%3D4.74%2B%5Clog%28%5Cfrac%7B%5BCH_3COONa%5D%7D%7B0.200%7D%29)
![[CH_3COONa]=0.364mol](https://tex.z-dn.net/?f=%5BCH_3COONa%5D%3D0.364mol)
To calculate the mass of sodium acetate for given number of moles, we use the equation:
Molar mass of sodium acetate = 83.06 g/mol
Moles of sodium acetate = 0.364 moles
Putting values in above equation, we get:
Hence, the mass of sodium acetate that must be added is 30.23 grams
(29.8 g) / [0.184 mol (44.00964 g CO2/mol)] =0.832= 83.2% yield CO2
(hope this helps)
Answer: The concentration of the reactants and products remain constant!
Explanation: <em>remember that </em><em>a dynamic equilibrium is a state of balance in which the rates of the forward and reverse reactions are equal,</em><em> and they continue to occur at an equivalent and constant rate with the same amount of product and reactants!</em>
It would protect best against C) Alpha radiation, as Beta radiation is stopped by lighter metals such as aluminium, and Gamma radiation can only be stopped by heavier metals such as lead.
