please help me with finding moles of lead ransferred, mol and molar mass of lead
ID: 521539 • Letter: P
Question
please help me with finding moles of lead ransferred, mol and molar mass of lead , g mol-1, for trail 1 and for trail 2 please help wih molar mass of lead g mol-1 , moles of lead transfered, mole and the average molar mass of trail 1 and 2. the parts with the question marks are he ones i don't know how to find.
Before electrolysis
After electrolysis
Mass of anode,g
18.9220
Mass of anode
18.5435
Mass of cathode, g
17.9294
Mass of cathode, g
17.9983
Initial current A
.0146 A
Mass of lead transferred, g
0.3785
Current @ 5min,A
0.142
Average current
0.143
@10min
0.142
Moles of electrons transferred, mol
2
@15min
0.142
Time elapsed, s
1800
@20min
0.142
Molar mass of lead, g mol-1
???
@25min
0.142
Moles of lead transferred, mol
???
@30min
.142
Trail 2
Before electrolysis
After
Mass of anode
17.9983
Mass of anode, g
17.9764
Mass of cathode, g
18.5435
Mass of cathode, g
19.9769
Initial current, A
0.148
Mass of lead transferred g
0.0219
@5min
0.149
Time elapsed, s
1800
@10min
0.148
Average current, A
0.148
@15
0.147
Moles of electrons transferred, mol
2
@20
0.147
Moles of lead transferred , mol
????
@25
0.147
Molar mass of lead g mol-1
??????
@30
0.147
Average molar mass of trail 1 and 2
?????
Before electrolysis
After electrolysis
Mass of anode,g
18.9220
Mass of anode
18.5435
Mass of cathode, g
17.9294
Mass of cathode, g
17.9983
Initial current A
.0146 A
Mass of lead transferred, g
0.3785
Current @ 5min,A
0.142
Average current
0.143
@10min
0.142
Moles of electrons transferred, mol
2
@15min
0.142
Time elapsed, s
1800
@20min
0.142
Molar mass of lead, g mol-1
???
@25min
0.142
Moles of lead transferred, mol
???
@30min
.142
Trail 2
Before electrolysis
After
Mass of anode
17.9983
Mass of anode, g
17.9764
Mass of cathode, g
18.5435
Mass of cathode, g
19.9769
Initial current, A
0.148
Mass of lead transferred g
0.0219
@5min
0.149
Time elapsed, s
1800
@10min
0.148
Average current, A
0.148
@15
0.147
Moles of electrons transferred, mol
2
@20
0.147
Moles of lead transferred , mol
????
@25
0.147
Molar mass of lead g mol-1
??????
@30
0.147
Average molar mass of trail 1 and 2
?????
Explanation / Answer
In trail 1.: The equivalent weight of lead (Pb) M = molar mass of Pb/ no of mole of electron
molar mass Pb = 207.2 gm/ mol
now M = 207.2/ 2 = 103.6
moles of lead transferred = mass of Lead/ equivalent weight of lead
= 0.3785 gm/ 103.6 gm-mol-1
mole of lead = 0.00365 mol
Similarly in trail 2:
moles of lead transferred = 0.0219/ 103.6
= 0.000211 mol
Average molar mass 103.6
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