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allsm [11]
2 years ago
7

A gas cylinder contains exactly 1 mole of oxygen gas (O2). How many molecules of oxygen are in the cylinder? 4. 01 × 1022 molecu

les 6. 02 × 1023 molecules 9. 03 × 1024 molecules 2. 89 × 1026 molecules.
Chemistry
1 answer:
Over [174]2 years ago
5 0

The number of molecules on 1 mole of oxygen has been 6.023\;\times\;10^2^3 molecules. Thus, option B is correct.

The molecule has been the smallest unit of the compound. It has been the repeating unit to form the compound.

The molecule has been formed with the combination of the elements in the fixed proportion.

<h3>Number of molecules in a mole</h3>

The number of molecules in a mole of sample has been given by Avogadro's law. According to this, the number of molecules in a mole of sample has been equivalent to the Avogadro number.

The value of Avogadro number has been 6.023\;\times\;10^2^3.

Thus, the one mole of sample has been consisted of 6.023\;\times\;10^2^3 molecules.

The number of molecules on 1 mole of oxygen has been 6.023\;\times\;10^2^3 molecules. Thus, option B is correct.

Learn more about molecules, here:

brainly.com/question/19556990

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What is the sign of the charge of an electron
oksian1 [2.3K]

Answer:

Electrons have negative charge.

4 0
2 years ago
Calculate molality,molarity and mole fraction of KI if the density of 20%(mass) aqueous KI is 1.202 g/mL
Scorpion4ik [409]
Basis: 1 L of the substance.
               (1.202 g/mL) x (1000 mL) = 1202 g 
                   mass solute = (1202 g) x 0.2 = 240.2 g
                   mass solvent = 1202 g x 0.8 =  961.6 g
                   moles KI = (240.2 g) x (1 mole / 166 g)  = 1.45 moles
                   moles water = (961.6 g) x (1 mole / 18 g) = 53.42 moles
1. Molality = moles solute / kg solvent 
                  = 1.45 moles / 0.9616 kg = 1.5 m
2. Molarity = moles solute / L solution
                  = 1.45 moles / 1 L solution = 1.45 M
3. molar mass = mole solute / total moles
                        =  1.45 moles / (1.45 moles + 53.42 moles) = 0.0264 

5 0
3 years ago
While ethanol (CH3CH2OH) is produced naturally by fermentation, e.g. in beer- and wine-making, industrially it is synthesized by
grin007 [14]

Answer:

n_{C2H_5OH}^{eq}=14.234mol

Explanation:

Hello,

In this case, the reaction is:

C_2H_4+H_2O\rightleftharpoons CH_3CH_2OH

Thus, the law of mass action turns out:

Kc=\frac{[CH_3CH_2OH]_{eq}}{[H_2O]_{eq}[CH_2CH_2]_{eq}}

Thus, since at the beginning there are 29 moles of ethylene and once the equilibrium is reached, there are 16 moles of ethylene, the change x result:

[CH_2CH_2]_{eq}=29mol-x=16mol\\x=29-16=13mol

In such a way, the equilibrium constant is then:

Kc=\frac{\frac{x}{V} }{\frac{16mol}{V}* \frac{3mol}{V}} =\frac{\frac{13mol}{75.0L} }{\frac{16mol}{75.0L}* \frac{3mol}{75.0L}} =20.31

Thereby, the initial moles for the second equilibrium are modified as shown on the denominator in the modified law of mass action by considering the added 15 moles of ethylene:

Kc=\frac{\frac{13+x_2}{V} }{\frac{16+15-x_2}{V}* \frac{3-x_2}{V}}  =20.31

Thus, the second change, x_2 finally result (solving by solver or quadratic equation):

x_2=1.234mol

Finally, such second change equals the moles of ethanol after equilibrium based on the stoichiometry:

n_{C2H_5OH}^{eq}=x+x_2=13mol+1.234mol\\n_{C2H_5OH}^{eq}=14.234mol

Best regards.

5 0
3 years ago
Please select the word from the list that best fits the definition
Law Incorporation [45]

Answer:

wave speed

Explanation:

A wave is a disturbance that transmits energy from one place to another without the actual displacement of the particles of the medium.

To find the wave speed we need to determine the product of its frequency and wavelength.

  Wave speed  = Frequency x wavelength

Frequency of wave is the number of wave that passes through a point at a unit time.

Wavelength is the displacement of a complete wave train.

3 0
3 years ago
Describe two ways that thermal energy transfer in earth changes the land
zmey [24]
There are three methods of thermal energy transfer: conduction, convection, and radiation. Air molecules that come into contact with the warmer land and surface of the oceans and lakes increase their thermal energy through conduction.
4 0
3 years ago
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