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kherson [118]
3 years ago
10

32p is a radioactive isotope with a half-life of 14.3 days. if you currently have 38.1 g of 32p, how much 32p was present 9.00 d

ays ago?
Chemistry
1 answer:
AleksandrR [38]3 years ago
3 0
T=14.3 d
m₁=38.1 g
t=9.00 d
m₂-?

m₂=2m₁·e^[-(T-t)ln2/T]

m₂=2·38.1·e^[-(14.3-9)ln2/14.3]=58.94 g
58.94 g ³²P was present 9.00 days ago
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The heat of vaporization of a liquid is 84.0 J/g. How many joules of heat would it take to completely vaporize 172 g of this liq
Aliun [14]

Answer:

14,448 J of heat would it take to completely vaporize 172 g of this liquid at its boiling point.

Explanation:

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to Q = m*L, where L is called the latent heat of the substance and depends on the type of phase change.

During the evaporation process, a substance goes from a liquid to a gaseous state and needs to absorb a certain amount of heat from its immediate surroundings, which results in its cooling. The heat absorbed is called the heat of vaporization.

So, it is called "heat of vaporization", the energy required to change 1 gram of substance from a liquid state to a gaseous state at the boiling point.

In this case, being:

  • Q=?
  • m= 172 g
  • L= 84 \frac{J}{g}

and replacing in the expression Q = m*L you get:

Q=172 g*84 \frac{J}{g}

Q=14,448 J

<u><em>14,448 J of heat would it take to completely vaporize 172 g of this liquid at its boiling point.</em></u>

5 0
2 years ago
The air all around us is a mixture of gasses containing nitrogen, oxygen, carbon dioxide, argon
KiRa [710]

Answer:

Total pressure = 4.57 atm

Explanation:

Given data:

Partial pressure of nitrogen = 1.3 atm

Partial pressure of oxygen = 1824 mmHg

Partial pressure of carbon dioxide = 247 torr

Partial pressure of argon = 0.015 atm

Partial pressure of water vapor = 53.69 kpa

Total pressure = ?

Solution:

First of all we convert the units other into atm.

Partial pressure of oxygen = 1824 mmHg / 760 = 2.4 atm

Partial pressure of carbon dioxide = 247 torr / 760 = 0.325 atm

Partial pressure of water vapor = 53.69 kpa / 101 = 0.53 atm

Total pressure = Partial pressure of N +  Partial pressure of O +  Partial pressure of CO₂ +  Partial pressure of Ar +  Partial pressure of water vapor

Total pressure = 1.3 atm + 2.4 atm + 0.325 atm + 0.015 atm + 0.53 atm

Total pressure = 4.57 atm

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3 years ago
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pishuonlain [190]

Answer:c

Explanation:

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7 0
3 years ago
6. What is the production of a magnetic field by electric current called.
nirvana33 [79]
The answer is electromagnetism.

The definition of electromagnetic is:
relating to the interrelation of electric currents or fields and magnetic fields.

Therefore, the verb form of electromagnetic would be ELECTRONAGNETISM
5 0
3 years ago
A 25.0 mL sample of 0.123 M HCl was titrated with 18.04 mL of NaOH . What is the concentration of the NaOH ?
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Answer:

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Explanation:

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