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masya89 [10]
3 years ago
8

The decay constant of plutonium-239, a waste product from nuclear reactors, is 2.88×10−5year−1. part a what is the half-life of

239pu?
Chemistry
1 answer:
faust18 [17]3 years ago
3 0
<span>24100 years
   You can easily convert from decay constant to half-life by using the relationship:
 H = ln(2)/D
  where
 H = half life
  D = decay constant
 ln(2) = natural logarithm of 2.
So
 H = ln(2)/D
 H = 0.693147181/2.88x10^-5 1/year
  H = 2.41x10^4 year
 H = 24100 year</span>
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The density of a metal is 10.5 g/cm3. If the mass of themetal
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Answer:

11.7 mL

Explanation:

Density of a substance is given by the mass of the substance divided by the volume of the substance .

Hence , d = m / V

V = volume

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From the question ,

The density of the metal = 10.5 g/cm³

The mass of the metal = 5.25 g

Hence , the volume can be calculated from the above formula , i.e. ,

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4 0
3 years ago
PRACTICE PROBLEMS
Likurg_2 [28]
72.6g
The density formula is density equal mass divided by volume (d=m/v) to solve this you must get the mass by itself. You do this by multiply volume on both sides which then gets you density times volume equal mass. Then you can plug in the numbers which is 1.20g/mL x 60.5 mL the mL cancels out which leaves you with grams and thus you have 72.6g.
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Explanation:

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