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Jobisdone [24]
3 years ago
11

A 806.3 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. after 47 days th

e amount of radioactive substance had decreased to 100.8 ng. how many half-lives of the unknown radioactive substance have occurred?
Chemistry
1 answer:
skelet666 [1.2K]3 years ago
3 0
The substance has completed 3 half lives.
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If a car travels 20 miles in 2 hours, how fast is the car driving?
Vera_Pavlovna [14]

Answer: distance by time

20/2=10

Explanation:

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2 years ago
Monodisperse polyacrylonitrile contains molecules with the general formula -(CH2CHCN)n-, where n is typically greater than 10,00
pentagon [3]

Answer:

7.68 × 10²⁴

Explanation:

Step 1: Calculate the mass of 1 molecule of the monomer CH₂CHCN

We will get the mass of the monomer by adding the masses of the elements.

mCH₂CHCN = 3 × mC + 3 × mH + 1 × mN

mCH₂CHCN = 3 × 12.01 amu + 3 × 1.01 amu + 1 × 14.01 amu = 53.07 amu

Step 2: Convert the mass of the monomer to grams

We will use the conversion factor 1 amu = 1.66 × 10⁻²⁴ g

53.07 amu × 1.66 × 10⁻²⁴ g/1 amu = 8.81 × 10⁻²³ g

Step 3: Calculate "n"

We will divide the mass of the polymer by the mass of the monomer.

n = 676.8 g / 8.81 × 10⁻²³ g = 7.68 × 10²⁴

6 0
3 years ago
34. Given the fact that the concentrations of reactants and
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Answer:

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Hope this helps you out!

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Whay happens regularly in fission reaction
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Answer:

In nuclear fission, an unstable atom splits into two or more smaller pieces that are more stable, and releases energy in the process. The fission process also releases extra neutrons, which can then split additional atoms, resulting in a chain reaction that releases a lot of energy.

Explanation:

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<span> this represents the relative overall energy of each orbital, and the energy of each orbital increases as the distance from the nucleus increases</span>
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3 years ago
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