Answer:
Ka = 4.9 X 10^-9
Explanation:
when the pH is 4.95
the [H+] = 10^-4.95
[H+] = 1.122 e-5
since the equilibrium equation is:
HCN <=> 1 mole H+ & 1 mole CN-
then
[H+] = [CN-]
when
HCN <=> H+ & CN-
Ka = [ H+] [CN-] / [HCN]
Ka = [ 1.122 e-5] [ 1.122 e-5] / [0.255]
Ka = 1.256 e-10 / 0.255
Ka = 4.94 e-9
which rounds off to 2 sig figs into
Ka = 4.9 X 10^-9
======================
p.s. it was the pH pf 4.95 that limited the calculations to 2 sig figs
Sodium is the most common extracelluar cation, while potassium is the most abundant intracellular cation.
<span>The temperature change is greater when assuming that the mass is constant and the heat must be greater </span>in the result the heat of the metal as being reported too high.
hope it helps
Answer: It is temperature and density.
Explanation:
Answer:
A
Explanation:
I believe the answer is A. An object is every color except the color we see, or the color that bounces off of said object. Therefore if a carpet is yellow, the carpet is every color but yellow. Yellow is the color that it rejects, bounces off of it, and the one we see.