2) A uniform deposit of 10.0 grams of silver is needed to completely coat a meta

Question

2) A uniform deposit of 10.0 grams of silver is needed to completely coat a metal spoon with silver. How long ( in minutes) would a current of 12.0 A have to be passed through a solution of AgNOs to silver-coat the metal spoon? 3) A particular first-order reaction has a rate constant of 1.35 x 102 s-1 at 25.0 °C. What is the 4) The half-life for beta decay of strontium-90 is 28.8 years. A milk sample is found to contain 10.3 ppm strontium-90. a) How many years would pass before the strontium-90 concentration would drop to 1.0 ppm? b) Write the balanced equation for the radioactive decay of strontium-90, and identify the decay product

Explanation / Answer

2)

the electrolysis expression is:

Ag1+ + 1e- ------> Ag

1 mol of Ag requires 1 mol of electron

1 mol of electron = 96485 C

So,1 mol of Ag requires 96485 C

let us calculate mol of element deposited:

we have below equation to be used:

number of mol, n = mass/molar mass

= 10/107.9

= 0.09268 mol

total charge = mol of element deposited * charge required for 1 mol

= 0.09268*96485

= 8942.076 C

we have below equation to be used:

time = Q/i

= 8942.076/12

= 745.173 seconds

= 745.173/60 min

= 12.4 min

Answer: 12.4 minutes

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