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alexandr1967 [171]
2 years ago
9

Calculate the moles of 70g of Li

Chemistry
1 answer:
ValentinkaMS [17]2 years ago
5 0

\text{No. of moles} = \dfrac{\text{Mass of substance(Li)}}{\text{Molar mass of of substance(Li)}}\\\\\\~~~~~~~~~~~~~~~~~=\dfrac{70}{6.94}\\\\\\~~~~~~~~~~~~~~~~~=10.08~ \text{mol.}

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4.A 100 L sample of gas is at a pressure of 80 kPa and a temperature of 200 K. What volume does the same
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Answer:

V₂ = 107.84 L

Explanation:

Given data:

Initial volume = 100 L

Initial pressure = 80 KPa (80/101 =0.79 atm)

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Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

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V₁ = Initial volume

T₁ = Initial temperature

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V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁T₂  /T₁P₂

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Compute the values of the diffusion coefficients for the interdiffusion of carbon in both α-iron (BCC) and γ-iron (FCC) at 900°C
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Answer:

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Explanation:

Taking each parameters or data at a time, we can determine the values/a constant for each parameters in the diffusion coefficient equation.

For α-iron (BCC), the diffusion coefficient = pre-exponential value,Ao × e^( -Activation energy,AE)/gas constant,R × Temperature.

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For α-iron (BCC), the pre-exponential value, Ao = 1.1 × 10^-6, and the activation energy, AE = 87400.

Thus, we have that the diffusion coefficient = 1.1 × 10^-6 × e(-87400)/1173.15 × 8.31.

Diffusion coefficient for α-iron (BCC) = 1.41 × 10^-10 m^2/s.

Also, For the γ-iron (FCC), the pre-exponential value, Ao = 2.3 × 10^-5 and the activation energy, AE = 148,00.

From these values we can see that both the exponential value, Ao and the activation energy for γ-iron (FCC) are higher than that of α-iron (BCC).

Thus, the diffusion coefficient for the γ-iron (FCC) = 2.3 × 10^-5 × e ^-(14800)/8.31 × 1173.15.

Then, the diffusion coefficient for the γ-iron (FCC) = 5.87 × 10^-12 m2/s.

Therefore, there will be faster diffusion in α-iron (BCC) because of lower activation energy and vice versa.

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