: a science that deals with the composition, structure, and properties of substances and with the transformations that they undergo
2a : the composition and chemical properties of a substance
the chemistry of iron
b : chemical processes and phenomena (as of an organism)
Answer:
![\%LiClO_3=90.4\%](https://tex.z-dn.net/?f=%5C%25LiClO_3%3D90.4%5C%25)
Explanation:
Hello!
In this case, since the undergoing chemical reaction is:
![LiClO_4\rightarrow LiCl+\frac{3}{2} O_2](https://tex.z-dn.net/?f=LiClO_4%5Crightarrow%20LiCl%2B%5Cfrac%7B3%7D%7B2%7D%20O_2)
It is widely known that when a gas given off from a reaction is collected over water, we can compute its pressure by minusing the total pressure 762 mmHg and the vapor pressure of water at the experiment's temperature (20 °C) in this case 17.5 mmHg as shown below:
![p_{O_2}=762mmHg-17.5mmHg=744.5mmHg*\frac{1atm}{760mmHg}=0.980atm](https://tex.z-dn.net/?f=p_%7BO_2%7D%3D762mmHg-17.5mmHg%3D744.5mmHg%2A%5Cfrac%7B1atm%7D%7B760mmHg%7D%3D0.980atm)
Next, by using the ideal gas equation we compute the yielded moles of oxygen considering the collected 313 mL (0.313 L):
![n_{O_2}=\frac{PV}{RT}=\frac{0.980atm*0.313L}{0.082\frac{atm*L}{mol*K}*293.15K}\\\\ n_{O_2}=0.0128molO_2](https://tex.z-dn.net/?f=n_%7BO_2%7D%3D%5Cfrac%7BPV%7D%7BRT%7D%3D%5Cfrac%7B0.980atm%2A0.313L%7D%7B0.082%5Cfrac%7Batm%2AL%7D%7Bmol%2AK%7D%2A293.15K%7D%5C%5C%5C%5C%20%20n_%7BO_2%7D%3D0.0128molO_2)
Now, via the 3/2:1 mole ratio between oxygen and lithium chlorate (molar mass = 90.39 g/mol), we compute the original mass of decomposed lithium chlorate as follows:
![m_{LiClO_3}=0.0128molO_2*\frac{1molLiClO_3}{3/2molO_2}*\frac{90.39gLiClO_3}{1molLiClO_3} \\\\m_{LiClO_3}=0.771gLiClO_3](https://tex.z-dn.net/?f=m_%7BLiClO_3%7D%3D0.0128molO_2%2A%5Cfrac%7B1molLiClO_3%7D%7B3%2F2molO_2%7D%2A%5Cfrac%7B90.39gLiClO_3%7D%7B1molLiClO_3%7D%20%20%5C%5C%5C%5Cm_%7BLiClO_3%7D%3D0.771gLiClO_3)
Now, the percentage is computed as shown below:
![\%LiClO_3=\frac{0.771g}{0.853g} *100\%\\\\\%LiClO_3=90.4\%](https://tex.z-dn.net/?f=%5C%25LiClO_3%3D%5Cfrac%7B0.771g%7D%7B0.853g%7D%20%2A100%5C%25%5C%5C%5C%5C%5C%25LiClO_3%3D90.4%5C%25)
Best regards!
Answer:
Zinc helps your immune system
Explanation:
debris from the volcanic ash has covered the sun which makes the temperature cold.