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Rasek [7]
2 years ago
9

Thallium consists of 29.5%TI-203 and 70.5%TI-205. What is the relative atomic mass of thallium?

Chemistry
2 answers:
Gnesinka [82]2 years ago
8 0

Answer:

B. 204 amu

Explanation:

Given:

Isotopes of Thallium and % abundances

Tl-203 : 29.5%

Tl-205: 70.5%

Formula:

Relative atomic mass = \sum (Isotope mass * abundance)/100

It is given by the summation of the product of all the isotope masses and their % abundances

For Thallium:

Relative atomic mass = [203*29.5 + 205*70.5]/100 = 204.41 amu

Since the number of significant digits is 3, the relative atomic mass = 204 amu

ololo11 [35]2 years ago
7 0
E. 204.4 hope this helps
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