I believe the correct answer from the choices listed above is option B. A chemical formula written above or below the yield sign indicates <span>that the substance is used as a catalyst. I am certain with this answer. Hope this helps. Have a nice day.</span>
Answer:
384.2 K
Explanation:
First we convert 27 °C to K:
- 27 °C + 273.16 = 300.16 K
With the absolute temperature we can use <em>Charles' law </em>to solve this problem. This law states that at constant pressure:
Where in this case:
We input the data:
300.16 K * 1600 m³ = T₂ * 1250 m³
And solve for T₂:
T₂ = 384.2 K
The mass percent lithium hydroxide in the mixture with potassium hydroxide, calculated from the equivalence point in the titration of HCl with the mixture, is 19.0%.
The mass percent of lithium hydroxide can be calculated with the following equation:
(1)
Where:
(2)
We need to find the mass of LiOH.
From the titration, we can find the number of moles of the mixture since the number of moles of the acid is equal to the number of moles of the bases at the equivalence point.
![\eta_{HCl} = \eta_{LiOH} + \eta_{KOH}](https://tex.z-dn.net/?f=%20%5Ceta_%7BHCl%7D%20%3D%20%5Ceta_%7BLiOH%7D%20%2B%20%5Ceta_%7BKOH%7D%20)
![0.0271 L*0.3565 \frac{mol}{L} = \eta_{LiOH} + \eta_{KOH}](https://tex.z-dn.net/?f=%200.0271%20L%2A0.3565%20%5Cfrac%7Bmol%7D%7BL%7D%20%3D%20%5Ceta_%7BLiOH%7D%20%2B%20%5Ceta_%7BKOH%7D%20)
![\eta_{LiOH} + \eta_{KOH} = 9.66 \cdot 10^{-3} \:mol](https://tex.z-dn.net/?f=%20%5Ceta_%7BLiOH%7D%20%2B%20%5Ceta_%7BKOH%7D%20%3D%209.66%20%5Ccdot%2010%5E%7B-3%7D%20%5C%3Amol%20)
Since mol = m/M, where M: is the molar mass and m is the mass, we have:
(3)
Solving equation (2) for m_{KOH} and entering into equation (3), we can find the mass of LiOH:
Solving for
, we have:
![m_{LiOH} = 0.082 g](https://tex.z-dn.net/?f=%20m_%7BLiOH%7D%20%3D%200.082%20g%20)
Hence, the percent lithium hydroxide is (eq 1):
Therefore, the mass percent lithium hydroxide in the mixture is 19.0%.
Learn more about mass percent here:
I hope it helps you!
Answer:
Answer is D.Blue.
Explanation:
The hottest stars tend to appear blue or blue-white, whereas the coolest stars are red.
I hope it's helpful!