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dexar [7]
3 years ago
10

There's a 50 gram sample of our Ra-229 it is half-life is 4 minutes how much will be left after 12 minutes

Chemistry
1 answer:
KIM [24]3 years ago
7 0

The half life of an isotope is the amount of time it will take for the given isotope to decay till the point where it reaches half of what amount you had started with.

If the half life of Ra-229 is 4 minutes then every 4 minutes the sample is reduced to half of what you had before

4 minutes.)     50/2 Ra-229 --> 25g Ra-229

8 minutes.)     25/2 Ra-229 --> 12.5 Ra-229

12 minutes.)    12.5/2 Ra-229 --> 6.25 Ra-229 remaining

<em>I beleive this is the correct answer</em>

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For each ionic compound formula, identify the main group to which X belongs: (c) X2SO4.
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In the ionic compound formula X₂SO₄, SO₄ has a -2 charge. Hence to balance this -2 charge of SO₄, X must have a +1 charge.

Group 1A elements form X⁺ type of ions because they are metals. So, they have the tendency to lose electrons.

Hence, X must belong to the 1A group.

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To learn more about Ionic compounds, visit: brainly.com/question/9167977

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Which of the following describes a compound?
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3 years ago
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2 years ago
What volume of 0.160 m li2s solution is required to completely react with 130 ml of 0.160 m co no3 2?
Over [174]
The  volume  of  0.160    m   Li2S  solution  required  to  completely  react  with  130 ml  of 0.160  CO(NO3)2  is calculated   as  below

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What is the atomic mass?
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