These ar the instructions: This is the data: These are the questions that need t

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These ar the instructions:

This is the data:

These are the questions that need to be answered:

Part 2. Determining Avogadro's Number 6. Prepare about 100 mL of ~0.25 M sulfuric acid (H2SO) in a 150 mL beaker from a 3.0 M stock solution. (Remember MiVi - M2V2.) You can dilute in a beaker (not a volumetric flask), as exact concentration is not important Insert a metal wire into a buret, and position it upside down into the 150 mL beaker as illustrated in Figure 2. Support with buret clamp and ring stand 7. buret Wire wire electrode acidic solution Figure 2. Electrochemistry cell 8. Draw the sulfuric acid solution up into the buret with a green pipet pump until the buret is almost entirely filled. Be careful not to get any acid inside the pump. Then lower the volume until the level is exactly at the 50.00 mL line. Connect the negative (black) lead to the electrode wire that is in the buret. Connect the positive (red) lead to the electrode wire that is in the beaker 9. 10. Have the instructor check your set-up before proceeding

Explanation / Answer

1) Half reaction

Cathodic reaction

2) The charge supplied = current X time = 40 X 7 X 60 seconds = 16800 coloumbs

n = q/e = 16800 C/1.6x10-19 C/electrons = 1.05 x10^23electrons

3) when two moles are used we obtain 1 mole of hydrogen gas

so 12.046 X 10^23 electrons will give mole of gas

so 1.05 X 10^23 electrons will give 0.087 moles of hydrogne gas

Or 0.087 X 6.023 X 10^23 molecules = 5.24 X 10^22 molecules

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