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Oliga [24]
4 years ago
10

MULTIPLE CHOICE

Chemistry
1 answer:
algol [13]4 years ago
4 0

What we can actually do is to find the number of moles of Ca.

moles Ca = 0.72 g / (40.08 g/mol) = 0.018 mol

 

From the given choices, we can all see that there are 1 mol of compound per 1 mole of Ca. Therefore the actual moles of compound is also 0.018 mol. From this, calculate the mass and the answer is the one which will give 2 g.

 

Answer:

D. CaCl2

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Answer : The value of diffusion coefficient is, 2.97\times 10^{-16}m^2/s

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D=D_o\times \exp \left(-\frac{Q_d}{RT}\right )

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Now put all the given values in the above formula, we get:

D=5.6\times 10^{-5}m^2/s\times \exp \left(-\frac{177kJ/mol}{(8.314J/mol.K)\times (820K)}\right )

D=2.97\times 10^{-16}m^2/s

Thus, the value of diffusion coefficient is, 2.97\times 10^{-16}m^2/s

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