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tangare [24]
3 years ago
5

PLEASE ANSWER THIS IS DUE TODAY!!

Chemistry
1 answer:
Snowcat [4.5K]3 years ago
5 0
Can you be more specific v
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Cobalt-60 can be used by scientists for the purpose of radioactive dating. Cobalt-60 has a half-life of 5,272 years. A fossilize
tigry1 [53]

Answer:

C) 10,500 years.

Explanation:

  • The decay of cobalt-60 is a first order reaction.
  • The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5272 year) = 1.314 x 10⁻⁴ year⁻¹.

The integration law of a first order reaction is:

kt = ln [A₀]/[A]

k is the rate constant = 1.314 x 10⁻⁴ year⁻¹.

t is the time = ??? years.

[A₀] is the initial percentage of cobalt-60 = 25.0 g.

[A] is the remaining percentage of cobalt-60 = 6.25 g.

∵ kt = ln [Ao]/[A]

∴ (1.314 x 10⁻⁴ year⁻¹)(t) = ln (25.0 g)/(6.25 g)

(1.314 x 10⁻⁴ year⁻¹)(t) = 1.386.

∴ t = 1.386/(1.314 x 10⁻⁴ year⁻¹) =  10,550 years ≅ 10,500 years.

5 0
3 years ago
Read 2 more answers
The number of moles of molecules in a 12.0-gram sample of Cl2 is equal too?
Anvisha [2.4K]

it is equal theres your answer  np :)

7 0
3 years ago
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Determine the mass in grams of 4.69 x 1021 atoms of barium. (The
Virty [35]

Answer:

1.07 g Ba

Explanation:

Hello there!

In this case, according to the definition of the Avogadro's number and the molar mass, it is possible to say that 6.022x10^{23} atoms of barium equal one mole, and at the same time, 1 mole equals 137.327 grams of this element; thus, it is possible to say that 6.022x10^{23} atoms of barium have a mass of 137.327 grams; therefore, it i possible for us to calculate the required mass in grams as shown below:

4.69x10^{21}atoms*\frac{137.327gBa}{6.022x10^{23} atoms} \\\\=1.07gBa

Best regards!

5 0
3 years ago
Which of the quantum numbers relate(s) to the electron only? Which relate(s) to the orbital?
olganol [36]

Answer:

Schrodinger's proposal, considered as the 5th atomic model, is to describe the characteristics of all the electrons in an atom, and for this I use what we know as quantum numbers.

Quantum numbers are called with the letters n, m, l and s and indicate the position and energy of the electron. No electron of the same atom can have the same quantum numbers.

Explanation:

n = main quantum number, which indicates the level of energy where the electron is, assumes positive integer values, from 1 to 7 and it is related to the orbital too.

I = secondary quantum number, which indicates the orbital in which the electron is located, can be s, p, d and f (0, 1, 2 and 3).

m = magnetic quantum number, represents the orientation of the orbitals in space, or the type of orbital, within a specific orbital. Assumes values ​​of the negative secondary quantum number (-l) through zero, to the positive quantum number (+ l).

s = quantum number of spin, which describes the orientation of the electron spin. This number takes into account the rotation of the electron around its own axis as it moves around the nucleus. Assumes only two values ​​+1/2 and - 1/2

5 0
3 years ago
It is January. The temperature is 33°F, and the wind is blowing. Huge clouds are coming in from the west.
Dimas [21]

Answer:

Explanation:

Since the atmosphere is fixed to the earth by gravity and rotates with the earth, there would be no circulation if some force did not upset the atmosphere's equilibrium.  The heating of the earth's surface by the sun is the force responsible for creating the circulation that does exist.

8 0
3 years ago
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