Answer: 
Explanation:-
Osmotic pressure is a colligative property which depends on the amount of solute added.

= osmotic pressure = 5.1 atm
C= concentration in Molarity
R= solution constant = 0.0821 Latm/Kmol
T= temperature = 312 K


Thus the equation for calculating the molarity of this solution is 
To solve this problem it is fundamentally, just look for the volume of the gas and convert it to cm3. At STP 1 mole = 22.4 liters. 8.00 moles x 22.4 liters/mole = 179.2 liters = 179,200 cm^3 Then. get the cube root of 179,200 cm^3. This would be equal to 56.38 cm and thus would be the length of the edge of this cube.
I'd say that the answer is erosion
Answer is valence electron, they all have total of 2 valence electron.
remember group number = valence electron