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A radioactive counter gave a reading of 266 min-1 for a 14.2 mg sample of cobalt(II)...

A radioactive counter gave a reading of 266 min-1 for a 14.2 mg sample of cobalt(II) chloride partially enriched with cobalt-60 (t1/2 = 5.2 yr). What percentage of the cobalt atoms is cobalt-60?

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Answer #1

Molar mass of cobalt(II) chloride is 129.8 g/mol.

Atomic weight of cobalt is 58.9 g/mol.

14.2 mg of cobalt(II) chloride

Number of Co atoms in sample

Half life period

The decay constant

The decay rate is

The expression for the decay rate is

Percentage of cobalt-60 in the sample

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