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

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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
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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. \(\sf Molar~mass=\sum(abundance~~\%*m_{isotope~i})\) \(\sf Molar ~mass_{Th}=0.3*m_{Th-203} + 0.71*m_{Th-205} \)
ummm okay

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

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