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kati45 [8]
3 years ago
7

What is the mass of 8.12 × 10^23 molecules of CO2 gas? (Atomic mass of carbon = 12.011 u; oxygen = 15.999 u.)

Chemistry
1 answer:
amid [387]3 years ago
4 0

Answer:

m=59.3gCO_2

Explanation:

Hello,

In this case, the first step is to compute the molar mass of carbon dioxide as shown below, considering it has one carbon atom and two oxygen atoms:

M=12.011g/mol+2*15.999g/mol\\\\M=44.009g/mol

It is important to notice it is the mass in one mole of such compound. Afterwards, we need to use the Avogadro's number to compute the how many moles are in the given molecules of carbon dioxide as shown below:

mol=8.12x10^{23}molec*\frac{1mol}{6.022x10^{23}molec} =1.35mol

Finally, the mass by using the molar mass:

m=1.35mol*\frac{44.009g}{1mol} \\\\m=59.3gCO_2

Best regards.

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Explanation:

Waves are one way in which energy may be transferred. Both mechanical and electromagnetic waves will transfer energy.

When a wave is drawn on a graph  the vertical axis is the amplitude of the wave while the horizontal axis can be either distance or time.

The highest point on the graph of the wave is called the crest and the lowest point is called the trough.The line through the center of the wave is the resting position of the medium if there was no wave passing through.

The different properties of a wave include:

Amplitude,wavelength,period,frequency,time-period,speed,velocity etc..

The wavelength of a wave is the distance between two two crests of a wave or two troughs of a wave. The wavelength is usually represented in physics by the Greek letter lambda (λ).  

The frequency of a wave is the number of  times per second that the wave cycles. Frequency is measured in Hertz or cycles per second and often represented by the lower case "f."  

The period of the wave is the time between wave crests. The period is measured in time units such as seconds and is usually represented by the upper case "T".  

The period and frequency are closely related to each other. The period equals  1 over the frequency and the frequency is equal to one over the period. They are reciprocals of each other as shown in the following formulas.

period = 1/frequency  or  T = 1/f

frequency = 1/period  or f = 1/T

Another important property of a wave is the speed of propagation. This is how fast the disturbance of the wave is moving. The speed of mechanical waves depends on the medium that the wave is traveling through. For example, sound will travel at a different speed in water than in air.  

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velocity = frequency * wavelength  or  v = f * λ

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Answer:

2. a) 2.67 mol.

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<em>2. Iron reacts with oxygen gas according to the following equation: </em>

<em>4Fe + 3O₂ → 2Fe₂O₃ , If 2 moles of oxygen gas is used in the reaction, </em>

  • Fe reacts with O₂ according to the balanced equation:

<em>4Fe + 3O₂ → 2Fe₂O₃,</em>

It is clear that 4 mole of Fe react with 3 mole of O₂ to  produce 2 moles of Fe₂O₃.

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3 mol of O₂ require  → 4 mol of Fe, from the stichiometry.

2 mol of O₂ require → ??? mol of Fe.

∴ The no. of moles of of Fe are required = (2 mol)(4mol)/(3 mol) = 2.67 mol.

(b) how many moles of iron(III) oxide, Fe₂O₃, will be produced?

<u><em>using cross multiplication: </em></u>

3 mol of O₂ produce → 2 mol of Fe₂O₃, from the stichiometry.

2 mol of O₂ require → ??? mol of Fe₂O₃.

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<em>3. Potassium sulfate can be prepared by the reaction between dilute sulfuric acid  and potassium carbonate. </em>

<em>H₂SO₄ + K₂CO₃ → K₂SO₄ + CO₂ + H₂O, </em>

<em>Calculate the mass of potassium sulfate that can be prepared from 3.45 g of  potassium carbonate.</em>

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H₂SO₄ + K₂CO₃ → K₂SO₄ + CO₂ + H₂O<em>,</em>

It is clear that 1 mole of H₂SO₄ reacts with 1 mole of K₂CO₃ to  produce 1 mole of K₂SO₄, 1 mole of CO₂ and 1 mole of H₂O.

Firstly, we need to calculate the no. of moles of 3.45 g of K₂CO₃:

no. of moles of K₂CO₃ = mass/molar mass = (3.45 g)/(138.205 g/mol) = 0.025 mol.

<u><em>using cross multiplication: </em></u>

1 mol of K₂CO₃ produce → 1 mol of K₂SO₄, from the stichiometry.

∴ 0.025 mol of K₂CO₃ produce → <em>0.025 mol of K₂SO₄.</em>

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4. The reaction between zinc and aqueous chromium(III) nitrate can be represented  by the following equation:

3Zn(s) + 2Cr(NO₃)₃ → 3Zn(NO₃)₂ + 2Cr

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3Zn(s) + 2Cr(NO₃)₃ → 3Zn(NO₃)₂ + 2Cr <em>,</em>

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Firstly, we need to calculate the no. of moles of 16.25 g of Zn:

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3 mol of Zn produce → 2 mol of Cr, from the stichiometry.

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∴ The no. of moles of Cr are produced = (2 mol)(0.25 mol)/(3 mol) = 0.167 mol.

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<em>5. Ethane, C₂H₆, burns in oxygen gas according to the following equation: </em>

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pressure produced.

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where, P is the pressure of the gas in atm (P = 1.0 atm).

V is the volume of the gas in L (V = 72.0 dm³ = 72.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 298.0 K, room temperature).

∴ n of ethane = PV/RT = (1.0 atm)(72.0 L)/(0.0821 L.atm/mol.K)(298.0 K) = 2.94 mol.

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<u><em>using cross multiplication: </em></u>

2 mol of C₂H₆ produce → 4 mol of CO₂, from the stichiometry.

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∴ The no. of moles of CO₂ are produced = (2.94 mol)(4.0 mol)/(2 mol) = 5.88 mol.

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