Answer:
30 moles of ethanol are needed to prepare a 25 m solution, using 1200 g of water
Explanation:
This a short problem of solutions:
Our solute is ethanol: C₂H₅OH
Our solvent is water-
25 m, is our solution's concentration. m means molality (moles of solute contained in 1kg of solvent).
Our solvent mass is 1200g. We convert them to kg
1200 g . 1kg / 1000g = 1.2 kg
m = mol/kg → mol = m . kg
mol = 25 mol/kg . 1.2kg →30 moles
Answer:
1.758 x 10⁻¹¹.
Explanation:
∵ pH = - log[H⁺].
∴ 5.47 = -log[H⁺].
log[H⁺] = -5.47.
∴ [H⁺] = 3.388 x 10⁻⁶ M.
∵ [H⁺] = √(Ka.C)
∴ [H⁺]² = Ka.C
<em>∴ Ka = [H⁺]²/C </em>= (3.388 x 10⁻⁶)²(0.653) = <em>1.758 x 10⁻¹¹.</em>
Answer:
Isopropanol and dichloromethane, distilled well below their boiling point.
Explanation:
The best way to separate isopropanol and dichloromethane is the method of fractional distillation. In this method, different compounds separate from each other due to difference in boiling. The boiling point of dichloromethane is 39.6 degree Celsius which is lower than the boiling point of isopropanol which is 82.5 degree Celsius. So dichloromethane will be evaporated when the temperature reaches to 40 degree Celsius and separated from isopropanol before reaching its boiling point.
HOPE YOU UNDERSTAND. PLEASE MARK IT AS BRAINLIEST
Answer:
A (3,5), B (1,7) ,C(-1,-3),D(1,-5)
Explanation:
M[1,1]= [Diagonals bisect each other]
![[ \frac{x_{1} + x_{2}}{2} , \frac{y_{1} + y_{2}}{2}]\\(\frac{3+x_{2} }{2} , \frac{5+y_{2} }{2})\\\frac{3+x_{2} }{2}=1 , \frac{5+y_{2} }{2}=1\\3 + x_{2} = 2 , 5 + y_{2} = 2\\x_{2} = -1 , y_{2} = -3\\\\](https://tex.z-dn.net/?f=%5B%20%5Cfrac%7Bx_%7B1%7D%20%2B%20x_%7B2%7D%7D%7B2%7D%20%2C%20%5Cfrac%7By_%7B1%7D%20%2B%20y_%7B2%7D%7D%7B2%7D%5D%5C%5C%28%5Cfrac%7B3%2Bx_%7B2%7D%20%7D%7B2%7D%20%2C%20%5Cfrac%7B5%2By_%7B2%7D%20%7D%7B2%7D%29%5C%5C%5Cfrac%7B3%2Bx_%7B2%7D%20%7D%7B2%7D%3D1%20%2C%20%5Cfrac%7B5%2By_%7B2%7D%20%7D%7B2%7D%3D1%5C%5C3%20%2B%20x_%7B2%7D%20%3D%202%20%20%2C%20%205%20%2B%20y_%7B2%7D%20%3D%202%5C%5Cx_%7B2%7D%20%3D%20-1%20%20%20%2C%20%20y_%7B2%7D%20%3D%20-3%5C%5C%5C%5C)
C(-1,-3)
M[1,1]= [Diagonals bisect each other]
![[\frac{x+1}{2} , \frac{y+7}{2}]\\\frac{x+1}{2}=1 , \frac{y+7}{2}=1\\x+1=2 , y+7=2\\x=1, y=-5](https://tex.z-dn.net/?f=%5B%5Cfrac%7Bx%2B1%7D%7B2%7D%20%2C%20%5Cfrac%7By%2B7%7D%7B2%7D%5D%5C%5C%5Cfrac%7Bx%2B1%7D%7B2%7D%3D1%20%20%2C%20%20%5Cfrac%7By%2B7%7D%7B2%7D%3D1%5C%5Cx%2B1%3D2%20%20%2C%20%20y%2B7%3D2%5C%5Cx%3D1%2C%20y%3D-5)
D(1,-5)
hence,
A (3,5), B (1,7) ,C(-1,-3),D(1,-5)
The answer is 17.5kg.
To get the mass of an object you do Volume × Density. The SI unit of Mass is "kg."
