1. You decide that your chemistry professor is going down, for that test he gave
ID: 991767 • Letter: 1
Question
1. You decide that your chemistry professor is going down, for that test he gave you! So you decide to give him a lead plated spoon (lead is not good for you). You use a battery with a current of 6.8 A, and plate a spoon in a solution of lead (IV) nitrate (PbNO3)4) for 34.5 mins. The density of lead is 11.34 g/cm3, the MW for lead = 207.2 g/mol.
a. What volume of lead in cm3 would have been plated on to the spoon?
b. The surface area of the spoon is 278.23 cm2. If you want to have a thickness of 2.56 x 10-3cm on the spoon, have you plated enough lead? Assuming the lead was plated evenly across the entire surface. Show work/ proof.
2. Write a 3-step nuclear decay reaction scheme for the nuclear transformation 243 over 95 Am --> 235 over 92 U
Explanation / Answer
a. W = Zit
z = E/F
Equivalent weight = 207.2/4 = 51.8
w = (E/F)it
= (51.8/96500)*6.8*34.5*60
= 7.55 grams
volume of lead plate = m/d
= 7.55/11.34 = 0.66 ml
b. volume = area*thickness
0.66 = 278.23*l
l = 0.00237 cm
= 2.37*10^-3 cm
no enough amount of Pb is not coated.
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