K-40 isotope 0.012% milk 371 mg

K-40 isotope 0.012% milk 371 mg

 

 

Potassium-40 (40K) is one of the few naturally occurring

radioactive isotopes of elements of low atomic number.

Its percent natural abundance among K isotopes is 0.012%.

How many 40K atoms do you ingest by drinking

one cup of whole milk containing 371 mg of K?

 

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(371 mg) (1 g / 1000 mg) (0.012/100) (1 mol / 40 g) (6.022×10^23 개/mol)

= (371) (1 / 1000) (0.012/100) (1 / 40) (6.022×10^23)

= 6.7×10^17 40K atoms

 

 

 

답: 6.7×10^17

 

 

 

 

[키워드] 371 mg 칼륨 기준문서, 칼륨의 동위원소 기준문서