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3 years ago

How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen ?

1 answer:

8 0

Each sample has the same number of molecules;
According to the Avogadro's number, or constant, one mole of a substance contains 6.022 × 10^23 constituents particles, usually atoms or molecules.
Therefore, 1 mole of oxygen contains 6.022 × 10^23 molecules,similar to 1 mole of nitrogen, which also contains 6.022 ×10^23 molecules

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Please Help! Let P and V represent the pressure and volume of Xe(g). If a piston is used to reduce the volume of the gas to V/2

Elza [17]

1) 2P

2) Average speed does not change

Explanation:

To solve the first part of the problem, we can use Boyle's Law, which states that:

"For a fixed mass of an ideal gas kept at constant temperature, the pressure of the gas is inversely proportional to its volume"

Mathematically:

$pV=const.$

where

p is the pressure of the gas

V is its volume

For the Xe gas in this problem we can write

$p_1 V_1 = p_2 V_2$

where:

$p_1 = P$ is the initial pressure

$V_1=V$ is the initial volume

$V_2=\frac{V}{2}$ is the final volume

Solving for p2, we find the final pressure:

$p_2=\frac{P V_1}{V_2}=\frac{pV}{V/2}=2P$

So, the pressure has doubled.

The average speed of the atoms/molecules in the gas is given by the formula

$v_{rms}=\sqrt{\frac{3RT}{M}}$

where

R is the gas constant

T is the absolute temperature (in Kelvin) of the gas

M is the molar mass of the gas

$v_{rms}$ is known as rms speed of the particles in the gas

From the formula, we see that the speed of the atoms in the gas depends only on the temperature of the gas.

In the Xe(g) gas in this problem, the temperature is kept constant; therefore, since nothing changes in the formula, this means that the average speed also does not change.

8 0

4 years ago

What is the difference between a mixture and a compound? (need an easy two sentence answer (able to explain it to a 8 your old).

lina2011 [118]

A mixture is made from two or more substances that are chemically unlike and are not chemically joined. A compound is a substance formed when two or more elements chemically react with each other to ... substances because no new substance is formed, therefore they do not have any fixed properties.

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3 years ago

What would indicate that a physical change takes place when cooper is drawn into wire

amid [387]

Answer:

When a copper is drawn into wire the only change that occurs is change in its shape and size no change will take place into its composition that is the wires are still possessing the properties of copper metal. Thus, a physical change takes place when copper is drawn into wire.

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3 years ago

Most metals are solid at room temperature Malibu ductile good conductors of heat and electricity and reacting to produce hydroge

kondaur [170]

Reacting to produce hydrogen gas is a chemical property

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3 years ago

Determine the frequency of light with a wavelength of 4.50 x 10-7 m.

jeyben [28]

The frequency of a photon of red light with wavelength 4.50 x 10−7m is 6.67 x 1014Hz

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3 years ago