Answer:
5.559*10^(23) atoms
Explanation:
Molar Mass of Al(OH)3 = 78 g/mol
(72g/78g/mol)*(6.022*10^(23)atoms/mol) = 5.559*10^(23) atoms in 72 grams of Al(OH)3
Answer:
697 g / mol
Explanation:
The osmotic pressure of a protein ( non electrolyte ) is given by:
π V= nRT where V is the volume, n is the number of moles, R is the gas constant ( 0.08206 L·atm/Kmol ), and T is the temperature (K).
n= mass/ MW protein ⇒ MW protein = mass / n
Thus,
π V = ( mass/ MW ) RT
MW = mass x R xT/ ( π V )
mass = 0.873 g
R = 0.08206 L·atm/K·mol
T = ( 15.6 + 273 ) K= 288.6 K
π = 0.061 atm
V = 48.6 mL = 48.6 mL x ( 1 L/ 1000 mL ) = 0.0486 L
We just need to plug our values into the aqbove equation for MW:
MW = 0.873 g x 0.08205 L· atm /K·mol x 288.6 K / ( 0.061 atm x0.0486 L )
= 697 g/mol
Answer:
C.
Explanation:
The increase the [H+] (concentration of H+ ions)
However, they decrease the pH if acids are added to any solution. Since they have more [H+] ions, they increase their conc. in the solution
idek what that is but i have the question on my homework rn
Answer:
Approximately 
.
Explanation:
Let 
be the final temperature of the water and the iron.
Temperature of the water would be increase by 
.
Temperature of the iron would be reduced by 
.
Let 
denote the specific heat of each material. Let 
denote the mass of the material. For a temperature change of 
, the energy change involved would be:
.
The energy that the water need to absorb would be:
.
The energy that the iron would need to release would be:
.
Since this calorimeter is insulated, the energy that the iron had released would be equal to the energy that the water had absorbed:
.
.
.
Thus, the final temperature of the water and the iron would be approximately .
