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2 years ago

How many moles is 3.85 x 1025 atoms of gold?

Chemistry

1 answer:

stich3 [128]2 years ago

4 0

Answer:

3.45 x 10^24 x 1 / 6.022 x 10^23 = 573

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Alveoli are tiny sacs of air in the lungs. Their average diameter is 4.50 × 10−5 m. Calculate the uncertainty in the velocity of

Arisa [49]

<u>Answer:</u> The uncertainty in the velocity of oxygen molecule is $4.424\times 10^{-5}m/s$

<u>Explanation:</u>

The diameter of the molecule will be equal to the uncertainty in position.

The equation representing Heisenberg's uncertainty principle follows:

$\Delta x.\Delta p=\frac{h}{2\pi}$

where,

$\Delta x$ = uncertainty in position = d = $4.50\times 10^{-5}m$

$\Delta p$ = uncertainty in momentum = $m\Delta v$

m = mass of oxygen molecule = $5.30\times 10^{-26}kg$

h = Planck's constant = $6.627\times 10^{-34}kgm^2/s^2$

Putting values in above equation, we get:

$4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg\times \Delta v=\frac{6.627\times 10^{-34}kgm^2/s}{2\times 3.14}\\\\\Delta v=\frac{6.627\times 10^{-34}kgm^2/s^2}{2\times 3.14\times 4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg}=4.424\times 10^{-5}m/s$

Hence, the uncertainty in the velocity of oxygen molecule is $4.424\times 10^{-5}m/s$

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3 years ago

It is winter, and you want to know where it might snow today. Look at the predicted temperature for each state. Then identify th

Alona [7]

Answer:

reeeeeeeeeeeeeee

Explanation:

reeeeeeeeeeeeeeeeeeeeeee

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3 years ago

Which of the following best explains what happens when you add ice to a glass of water?(2 points)

-Dominant- [34]

Answer:

Heat energy moves from the water to the ice cubes.

Explanation:

Heat energy moves from the water to the ice cubes, as water is at higher temperature than ice.

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3 years ago

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Which quantity is most closely related to the speed of gas particles?

max2010maxim [7]

The temperature of the gas, the hotter they get the faster they move. the colder they get, the slower they move

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3 years ago

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Which starch solution will decrease in volume as osmosis occurs?

iogann1982 [59]

For the following question(s), consider a 4% starch solution and a 10% starch solution separated by a semipermeable membrane.

Which of the following also occurs in this system?
There is a net flow of water from the 4% starch solution into the 10% starch solution

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3 years ago