Answer:
The answer is "5.18
".
Explanation:
It's a question of chemistry. Therefore, the following solution is provided:
We will first determine the solution's pOH. The following can possible:
The concentration of Hydroxide ion ![[OH^{-}] = 1.5\times 10^{-9}\ M](https://tex.z-dn.net/?f=%5BOH%5E%7B-%7D%5D%20%3D%201.5%5Ctimes%2010%5E%7B-9%7D%5C%20M)
![pOH =?\\\\pOH = -\log [OH^{-}]\\\\pOH = -\log 1.5\times 10^{-9}\\\\pOH = 8.82\\\\](https://tex.z-dn.net/?f=pOH%20%3D%3F%5C%5C%5C%5CpOH%20%3D%20-%5Clog%20%5BOH%5E%7B-%7D%5D%5C%5C%5C%5CpOH%20%3D%20-%5Clog%201.5%5Ctimes%2010%5E%7B-9%7D%5C%5C%5C%5CpOH%20%3D%208.82%5C%5C%5C%5C)
Furthermore, the pH of the solution shall be established. It was provided as follows:
When collecting all the like terms:
Therefore, the solution of pH is 5.18.
Answer:
atomic number of Be =4
electronic configuration :1s²2s²
but for Be2+ atomic number = 4-2 =2
electronic configuration : 1s²
Answer:
Molar mass→ 0.930 g / 6.45×10⁻³ mol = 144.15 g/mol
Explanation:
Let's apply the formula for freezing point depression:
ΔT = Kf . m
ΔT = 74.2°C - 73.4°C → 0.8°C
Difference between the freezing T° of pure solvent and freezing T° of solution
Kf = Cryoscopic constant → 5.5°C/m
So, if we replace in the formula
ΔT = Kf . m → ΔT / Kf = m
0.8°C / 5.5 m/°C = m → 0.0516 mol/kg
These are the moles in 1 kg of solvent so let's find out the moles in our mass of solvent which is 0.125 kg
0.0516 mol/kg . 0.125 kg = 6.45×10⁻³ moles. Now we can determine the molar mass:
Molar mass (mol/kg) → 0.930 g / 6.45×10⁻³ mol = 144.15 g/mol
Answer:
D)Gas particles move rapidly and have space between them.
Explanation:
Matter exists in three states namely: solids, liquids and gases. The particles contained in these three states are different from one another. In the gaseous state, the particles are FAR APART from one another i.e. space exists and they move at a very fast rate in contrast to the particles of a liquid, which have less space and move slower.
This rapid movement of gas particles within a less restricted space accounts for the reason why gaseous substances DIFFUSE more quickly than liquids.
