Answer:
pOH = -log[OH-]
Explanation:
Hello,
To calculate the pH or pOH of a substance, we relate it the negative logarithm of either the H+ or OH- concentration.
pOH is used to find the alkalinity of a solution my measuring the concentration of the hydroxide ion [OH-]. Solutions having a pOH value that is greater than 7 are said to be acidic while solutions with value less than 7 are alkaline.
pH = -log[H+]
While
pOH = -log[OH-]
Note: the pOH value of a solution depends on the concentration of the hydroxide ion in the solution.
6.02 x 10^23 is Alvogrado's number (Amedio Alvogrado is the name). This formula is determined to find the amount of particles within a substance by a mole.
I hope this helps!
Answer:
<h2>Density = 0.75 g/cm³</h2>
Explanation:
Density of a substance is given by
<h3>
</h3>
From the question
mass of the wood = 180 g
Since the wood is a cuboid we can find the volume using the formula
Volume = length × width × height
From the question
length = 10cm
width = 6 cm
height = 4 cm
Volume = 10 × 6 × 4 = 240 cm³
Substitute the values into the above formula and solve for the Density
That's
<h3>
</h3>
We have the final answer as
<h3>Density = 0.75 g/cm³</h3>
Hope this helps you
Answer:
a) unstable
b) unstable
c) unstable
d) Stable
Explanation:
a)
The given isotope , atomic number is greater than 83.(84>83).
Therefore, it is unstable.
b)
The given isotope has even number of protons(15) and neutrons(15).
Therefore, it is unstable.
c)
The given isotope has even number of protons(15).
Therefore, it is unstable.
d)
The given isotope have even number of neutrons ( 68) an d the proton ratio is .It is more than 1.25.
Therefore, it is stable.
Answer:
25.2 grams HOAc
Explanation:
For solution preparations a simple formula for determining amount of solute needed is ...
from solid stock => grams = Molarity x Volume (Liters) x formula wt of solute
∴ grams HOAc = M·V·f.wt = (0.839M)(0.500L)(60.05g/mol) = 25.2 grams HOAc
Mixing => Transfer gram wt of solute to mixing container and dilute up to but not to exceed total needed volume.