Meaning Of Avogadro
- Meaning Of Avogadro Constant
- How To Use Avogadro's Number
- English Meaning Of Avogadro
- Meaning Of Avogadro's Law
- Avogadro's Number Definition Chemistry
- Meaning Of The Word Avogadro
Avogadro's number is approximately 6.022x10^23—an almost unfathomably large quantity, greater than the number of grains of sand on earth or even the number of stars in the universe. Avogadro's number, 6.02x1023 6.02 x 10 23 is significant because it is the number of molecules that are present within one mole. This number was chosen because it allowed for the conversion of. Avogadro’s number tells us the number of particles in 1 mole (or mol) of a substance. These particles could be electrons or molecules or atoms. The value of Avogadro’s number is approximately 6.0221 mol−1. What is Avogadro’s Number?
A flat tire is not very useful. It does not cushion the rim of the wheel and creates a very uncomfortable ride. When air is added to the tire, the pressure increases as more molecules of gas are forced into the rigid tire. How much air should be put into a tire depends on the pressure rating for that tire. Too little pressure and the tire will not hold its shape. Too much pressure and the tire could burst.
Avogadro's Law
You have learned about Avogadro's hypothesis: equal volumes of any gas at the same temperature and pressure contain the same number of molecules. It follows that the volume of a gas is directly proportional to the number of moles of gas present in the sample. Avogadro's Law states that the volume of a gas is directly proportional to the number of moles (or number of particles) of gas when the temperature and pressure are held constant. The mathematical expression of Avogadro's Law is:
[V = k times n]
or
[dfrac{V_1}{n_1} = dfrac{V_2}{n_2}]
where (n) is the number of moles of gas and (k) is a constant. Avogadro's Law is in evidence whenever you blow up a balloon. The volume of the balloon increases as you add moles of gas to the balloon by blowing it up.
If the container holding the gas is rigid rather than flexible, pressure can be substituted for volume in Avogadro's Law. Adding gas to a rigid container makes the pressure increase.
Example (PageIndex{1})
A balloon has been filled to a volume of (1.90 : text{L}) with (0.0920 : text{mol}) of helium gas. If (0.0210 : text{mol}) of additional helium is added to the balloon while the temperature and pressure are held constant, what is the new volume of the balloon?
Solution
Steps for Problem Solving | |
---|---|
Identify the 'given' information and what the problem is asking you to 'find.' | Given: (V_1 = 1.90 : text{L}) (n_1 = 0.0920 : text{mol}) Find: (V_2 = ? : text{L}) |
List other known quantities. | Note that the final number of moles has to be calculated by adding the original number of moles to the moles of added helium. (n_2 = 0.0920 + 0.0210 = 0.1130 : text{mol}) |
Plan the problem. | First, rearrange the equation algebraically to solve for (V_2). [V_2 = frac{V_1 times n_2}{n_1}] |
Calculate. | Now substitute the known quantities into the equation and solve. [V_2 = frac{1.90 : text{L} times 0.1130 : cancel{text{mol}}}{0.0920 : cancel{text{mol}}} = 2.33 : text{L}] |
Think about your result. | Since a relatively small amount of additional helium was added to the balloon, its volume increases slightly. |
Exercise (PageIndex{1})
Meaning Of Avogadro Constant
A 12.8 L volume of gas contains .000498 moles of oxygen gas. At constant temperature and pressure, what volume does .0000136 moles of the gas fill?
How To Use Avogadro's Number
0.350 L
English Meaning Of Avogadro
Summary
- Calculations for relationships between volume and number of moles of a gas can be performed using Avogadro's Law.
Meaning Of Avogadro's Law
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Avogadro's Number Definition Chemistry
Contributions & Attributions
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Meaning Of The Word Avogadro
CK-12 Foundation by Sharon Bewick, Richard Parsons, Therese Forsythe, Shonna Robinson, and Jean Dupon.
Marisa Alviar-Agnew (Sacramento City College)
Henry Agnew (UC Davis)
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