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masya89 [10]
4 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]4 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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Question: What does it mean if an element is isoelectronic?

Answer: Isoelectronic is a term to describe a group of atoms or ions having the same number of electrons

Explanation: they are both the same because they bot have the same number of protons in each atom and they both will have the same always not diffrent its gonna have the same number

question answered by

(jacemorris04)

5 0
3 years ago
a major textile dye manufacutrer developed a new yellow dye. the dye has a percent composition of 75.95%C, 17.72%n and 6.33%H by
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The molecular formula of dye:

A major textile dye manufacturer developed a new yellow dye with a molecular formula C_{15}N_{3}H_{15}.

Given:

Percentage composition:

C = 75.95%

N = 17.72%

H = 6.33%

Molar mass = 240 g

To find: molecular formula of dye

Calculation:

Let's assume the mass of the compound is 100 gm.

So,  Mass of C = 75.95 gm

Mass of N = 17.72 gm

Mass of H = 6.33 gm

The number of moles = given mass/mass

Therefore, the number of moles of C = 75.95/12 = 6.33

The number of moles of N = 17.72/14 = 1.27

Number of moles of H =6.33/1 = 6.33

Simplest ratio:

C = 6.33/1.27 = 4.98 =5

N = 1.27/1.27 = 1

H = 6.33/1.27 = 4.98 =5

Therefore, the empirical formula is C_{5}NH_{5}

The mass of empirical formula = 12 x 5 + 14 + 1 x 5 = 79 gm

Number of moles= molar mass/ empirical formula

n = 240/79 = 3.04 =3

Therefore, molecular formula = empirical formula x n

Hence, molecular formula = C_{15}N_{3}H_{15}

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solution:

The Enter–Doudoroff pathway describes an alternate series of reactions that catabolize glucose to pyruvate using a set of enzymes different from those used in either glycolysis or the pentose phosphate pathway. .... Most bacteria use glycolysis and the pentose phosphate pathway.

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A student burns 1.50 mol C3H8 according to the following reaction:
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I think the answer is A. 1.98 x 10^2 g

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You have four water samples at different temperatures. In which sample are the molecules vibrating at the fastest speed? A. wate
tatiyna

Answer:

99°C

Explanation:

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