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koban [17]
3 years ago
9

Each of the jars was heated 90°C each jar was placed on the counter and allowed to cool

Chemistry
1 answer:
jeka943 years ago
8 0
Where is the rest of the question?
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Reptile [31]

 The half  life  of uranium- 238  is

 4.46 x10^9  years


 Explanation

Half life  is the time  taken for  the  radioactivity  of   a isotope  to fall  to half  its  original  value.

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  Half  of original  mass of uranium  = 4.0  mg /2 = 2.0  mg

since  it  take 4.46  x 10^ 9 years  for  the sample   to half  the half life of uranium -238 = 4.46 x10^9 years

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3 years ago
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