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Leokris [45]
3 years ago
14

Where do the words go? please help me ASAP!!!​

Chemistry
2 answers:
antiseptic1488 [7]3 years ago
8 0
1. Colocation
2. Locations (because ‘des’ is used for plural words)
3. Region
4. Confort personnelle
5. Économique
Number 3 and 4 I’m unsure of
Delicious77 [7]3 years ago
8 0

Answer:

ye

Explanation:

help

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The half-life of sr-90 is 28 years. after 56 years of decay only 0. 40 g of a sample remains. what was the mass of the original
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Half-life is the time taken for the concentration of the substance to reduce by 50%. The original sample of strontium had a mass of 1.6 gms. Thus, option d is correct.

<h3>What is half-life?</h3>

The half-life of any radioactive substance is the time period at which the concentration will get reduced to half the initial amount. The initial mass of Sr-90 is calculated as,

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\begin{aligned} 0.40 &= N_{0} (\dfrac{1}{2}) ^{{\frac{56}{28}}\\\\0.40 &= N_{0} (\dfrac{1}{2})^{2}\end{aligned}

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Learn more about half-life here:

brainly.com/question/16145921

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