Answer:
D) Fe3+ + 3e− → Fe (s) Eo = −0.036V
Explanation:
In electrolysis we have to add electrical energy for redox reactions non-spontaneous because ΔºG is positive.
These 4 reduction reactions are all non-spontaneous because their reduction potentials are negative (ΔGº = - nFεº , ΔGº will be positive). So the ion most easily reduced is the least negative, in this case Fe3+ + 3e− → Fe (s) Eo = −0.036V.
Answer:
The heavier isotope is 48.2 % (option d)
Explanation:
Step 1: Data given
Atomic weight of silver = 107.868 amu
Isotopes of silver:
107Ag = 106.904 amu
109Ag = 108.905 amu
Step 2: Calculate the percentages
107.868 = 106.904 * x + 108.905 *y
x+y = 1 ⇒ x = 1 - y
107.868 = 106.904 (1 - y) + 108.905*y
107.868 = 106.904 - 106.904y + 108.905y
0.964 = 2.001y
y = 0.4818
x = 1 - 0.4818 = 0.5182
Percentage 109Ag = 48.18 %
Percentage 107Ag = 51.82 %
The heavier isotope is 109Ag. Its percentage is 48.18 ≈ 48.2 %
The pH of the solution is 2.54.
Explanation:
pH is the measure of acidity of the solution and Ka is the dissociation constant. Dissociation constant is the measure of concentration of hydrogen ion donated to the solution.
The solution of C₆H₂O₆ will get dissociated as C₆HO₆ and H+ ions. So the molar concentration of 0.1 M is present at the initial stage. Lets consider that the concentration of hydrogen ion released as x and the same amount of the base ion will also be released.
So the dissociation constant Kₐ can be written as the ratio of concentration of products to the concentration of reactants. As the concentration of reactants is given as 0.1 M and the concentration of products is considered as x for both hydrogen and base ion. Then the
[HB] is the concentration of base.
Then
So the pH of the solution is 2.54.
Answer:
Volume stays.
Explanation:
If aerosol can throwing into the fire than the temperature of the aerosol can & the temperature of the contents of the gas in an aerosol will also increase, and it induces the pressure to rise.
Against the sides of the can, the gas molecules will smash rapidly with each other which are present inside an aerosol can, and the proportion of gas will stay the same as earlier. According to the law of conservation of matter, as a result of the heat, the gas particles can not be eradicated or expanded.