ilovebmth1234
  • ilovebmth1234
Thallium consists of about 30% Th-203 and 71% Th-205. The relative mass will be closest to what value? Question 5 options: A) 201 B) 202 C) 203 D) 204
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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ilovebmth1234
  • ilovebmth1234
@BioHazard9064 @arronq
aaronq
  • aaronq
This involves some simple math. The molar mass of an element (as listed on the periodic table) accounts for all the isotopes of that element in a weighted average according to their abundance in nature. \(\sf Molar~mass=\sum(abundance~~\%*m_{isotope~i})\) \(\sf Molar ~mass_{Th}=0.3*m_{Th-203} + 0.71*m_{Th-205} \)
ilovebmth1234
  • ilovebmth1234
ummm okay

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aaronq
  • aaronq
So all you do is multiply the abundance of each isotope by it's respective mass then add these values together.
aaronq
  • aaronq
The mass is indicated after the dash. For example, the mass of Th-203 is 203 lol
ilovebmth1234
  • ilovebmth1234
so D?
aaronq
  • aaronq
sounds right
ilovebmth1234
  • ilovebmth1234
thanks
aaronq
  • aaronq
no probs
ilovebmth1234
  • ilovebmth1234
i got a couple more questions are you busy?
aaronq
  • aaronq
nope, post them
ilovebmth1234
  • ilovebmth1234
okay thank you

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