The correct answer would be 3
Answer:
1.25 M
Explanation:
Step 1: Given data
Mass of KI (solute): 20.68 g
Volume of the solution: 100 mL (0.100 L)
Step 2: Calculate the moles of solute
The molar mass of KI is 166.00 g/mol.
20.68 g × 1 mol/166.00 g = 0.1246 mol
Step 3: Calculate the molar concentration of KI
Molarity is equal to the moles of solute divided by the liters of solution.
M = 0.1246 mol/0.100 L= 1.25 M
Answer:
The mass fraction of ferric oxide in the original sample :![\frac{723}{3110}](https://tex.z-dn.net/?f=%5Cfrac%7B723%7D%7B3110%7D)
Explanation:
Mass of the mixture = 3.110 g
Mass of ![Fe_2O_3=x](https://tex.z-dn.net/?f=Fe_2O_3%3Dx)
Mass of ![Al_2O_3=y](https://tex.z-dn.net/?f=Al_2O_3%3Dy)
After heating the mixture it allowed to react with hydrogen gas in which all the ferric oxide reacted to form metallic iron and water vapors where as aluminum oxide did not react.
![Fe_2O_3(s)+3H_2(g)\rightarrow 2Fe(s)+3H_2O(g)](https://tex.z-dn.net/?f=Fe_2O_3%28s%29%2B3H_2%28g%29%5Crightarrow%202Fe%28s%29%2B3H_2O%28g%29)
Mass of mixture left after all the ferric oxide has reacted = 2.387 g
Mass of mixture left after all the ferric oxide has reacted = y
![x=3.110 g- y=3.110 g - 2.387 g = 0.723 g](https://tex.z-dn.net/?f=x%3D3.110%20g-%20y%3D3.110%20g%20-%202.387%20g%20%3D%200.723%20g)
The mass fraction of ferric oxide in the original sample :
![\frac{0.723 g}{3.110 g}=\frac{723}{3110}](https://tex.z-dn.net/?f=%5Cfrac%7B0.723%20g%7D%7B3.110%20g%7D%3D%5Cfrac%7B723%7D%7B3110%7D)
This goes from longest to shortest wavelengths
Radio waves, microwaves, infrared, light, ultra violet, X-rays, gamma rays
Answer : Option C) Early modern era
Explanation : The historical era which was marked by the beginnings of European explorations, conquests of the Americas, trans-Atlantic slave trade and the rise of a globally intertwined economy was Early modern era. It was later followed by the medieval period.