Question

The element thallium is 70% thallium-205 and 30% thallium-203. Calculate its relative atomic mass to 1 decimal place.

Answer 1

# Answer-

Relative Atomic mass = 204.40 amu

# Explanation-

# Given-

Thallium-203 = 30%

Thallium-205 = 70%

# Solution-

Relative mass of thallium = (30×203 + 70×205)/100

Relative mass of thallium = (6090+14350)/100

Relative mass of thallium = (20440)/100

Relative mass of thallium = 204.40 amu

# Hence relative mass of thalium is 204.40 amu.

# Extras-

1)Thallium is used for infrared instruments and semiconductors.

2)Thallium and its compounds are very toxic causing multi-organ involvement.

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Answer 2

Answer:

The relative atomic mass = 204.4

Explanation:

Thallium -203 = 30% Thallium -205 = 70% Therefore , relative mass of thallium = (30×203 + 70×205)/100 relative mass of thallium = (20440)/100 relative mass of thallium = 204.40 amu Thus, relative atomic mass of thalium =204.4 ( to 1 decimal place).