Answer:
Explanation:
We must use the Nernst equation
1. Write the equation for the cell reaction
If you want the reduction potential, the pH 5.65 solution is the cathode, and the cell reaction is
<u> E°/V</u>
Anode: H₂(1 bar) ⇌ 2H⁺(1 mol·L⁻¹) + 2e⁻; 0
Cathode: <u>2H⁺(pH 5.65) + 2e⁻ ⇌ H₂(1 bar)</u>; <u> 0 </u>
Overall: 2H⁺ (pH 5.65) ⇌ 2H⁺(1 mol·L⁻¹); 0
Step 2. Calculate E°
(a) Data
E° = 0
R = 8.314 J·K⁻¹mol⁻¹
T = 25 °C
n = 2
F = 96 485 C/mol
pH = 5.65
Calculations:
T = 25 + 273.15 = 298.15 K
![\text{H}^{+} = 10^{\text{-pH}} = 2.24 \times 10^{-5}\text{ mol/\L}\\\\Q = \dfrac{\text{[H}^{+}]_{\text{prod}}^{2}}{\text{[H}^{+}]_{\text{react}}^{2}} = \dfrac{(1.00)^{2}}{(2.24 \times 10^{-5})^{2}} =2.00 \times 10^{9}\\\\\\E = 0 - \left (\dfrac{8.314 \times 298.15 }{2 \times 96485}\right ) \ln{2.00 \times 10^{9}}\\\\= -0.01285 \times 21.41 = \textbf{-0.275 V}\\\text{The cell potential for the cell as written is }\boxed{\textbf{-0.275 V}}](https://tex.z-dn.net/?f=%5Ctext%7BH%7D%5E%7B%2B%7D%20%3D%2010%5E%7B%5Ctext%7B-pH%7D%7D%20%3D%202.24%20%5Ctimes%2010%5E%7B-5%7D%5Ctext%7B%20mol%2F%5CL%7D%5C%5C%5C%5CQ%20%3D%20%5Cdfrac%7B%5Ctext%7B%5BH%7D%5E%7B%2B%7D%5D_%7B%5Ctext%7Bprod%7D%7D%5E%7B2%7D%7D%7B%5Ctext%7B%5BH%7D%5E%7B%2B%7D%5D_%7B%5Ctext%7Breact%7D%7D%5E%7B2%7D%7D%20%3D%20%5Cdfrac%7B%281.00%29%5E%7B2%7D%7D%7B%282.24%20%5Ctimes%2010%5E%7B-5%7D%29%5E%7B2%7D%7D%20%3D2.00%20%5Ctimes%2010%5E%7B9%7D%5C%5C%5C%5C%5C%5CE%20%3D%200%20-%20%5Cleft%20%28%5Cdfrac%7B8.314%20%5Ctimes%20298.15%20%7D%7B2%20%5Ctimes%2096485%7D%5Cright%20%29%20%5Cln%7B2.00%20%5Ctimes%2010%5E%7B9%7D%7D%5C%5C%5C%5C%3D%20-0.01285%20%5Ctimes%2021.41%20%3D%20%5Ctextbf%7B-0.275%20V%7D%5C%5C%5Ctext%7BThe%20cell%20potential%20for%20the%20cell%20as%20written%20is%20%7D%5Cboxed%7B%5Ctextbf%7B-0.275%20V%7D%7D)
Answer:
yes it is balanced.
Explanation:
when you are balancing an equation you look at the elements or compounds on the reactants and product side, which must have the same number of elements on both sides. like the question above;
2 potassium on the reactant and product side.
2 chlorine on the reactant and product side.
6 oxygen on the reactant and product side.
alkali metals are the most reactive family
they are located in column 1 on the periodic table
Oxygen and neon are both elements. Oxygen has 8 electrons and 8 protons. Neon has 10 electrons and 10 protons. Oxygen is also a non-metal element and Neon is a noble gas.
Answer:
10 moles
Explanation:
of moles = given mass /atomic mass = 280 g /28 g = 10 moles of Si atoms in 280g sample.
