The answer is Physical Means. I hope this helps. :)
Answer:
a)
b)
c)
d)
Explanation:
The reaction is:
Cr₂O₃(s) + 2Al(s) → 2Cr(s) + Al₂O₃(s)
a) To find the Al mass needed to react with 50 g of Cr₂O₃, we need to calculate the number of moles of Cr₂O₃:
Where:
: is the mass = 50 g
: is the molar mass = 2*52+3*16 = 152 g/mol
Now, the estoichiometric relation between Cr₂O₃ and Al is 1:2, so:
Hence, the mass of Al is:
b) The stoichiometric relation from Cr₂O₃ and Cr is 1:2, hence:
Thus, the mass of Cr is:
c) The number of moles of Cr₂O₃ with a mass of 5 kg is:
So, the mass of Cr is:
d) The mass of Cr produced from 5 tonnes of Cr₂O₃ is:
I hope it helps you!
Lack of temperature and lack of moisture
The correct answer is 0.16138
<u>Solution:</u>
Percentage transmission (%T) of the sample = 15.6
Therefore, Absorbance (A) 2 – log (%T) = 2 – log (15.6) = 0.8069
<u>Use Beer’s law:</u>
A = ε*c*l where ε = molar absorptivity of the solution, c = concentration of the solution, and l = path length of the solution.
Given A = 0.8069 and l = 5.00 cm, we must have
<u>0.8069 = ε*c*(5.00 cm)</u>
ε*c = 0.16138 cm-1
For the next part, assume that ε*c remains constant and we have
A’ = ε*c*l’ where l = 1.00 cm.
Plug in values and write
A’ = (0.16138 cm-1)*(1.00 cm) = 0.16138
The ratio of the light intensity entering the sample to the light intensity exiting the sample at a particular wavelength is defined as the transmittance. Absorption and transmission are two related and different quantities used in spectroscopy. The main difference between absorption and transmission is that absorption measures how much incident light is absorbed as it travels through the material, while transmission measures how much light is transmitted.
Learn more about The absorbance here:-brainly.com/question/14919298
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