We know that, 1 mole of any substance contain 6.022 X 10^23 atoms/molecules.
Thus, 6.022 X 10^23 atoms = 1 mole
Therefore, 1.29x10^24 =

= 2.14
Thus,
2.14 moles<span>
are present in 1.29x10^24 hydrogen atoms in HF.</span>
Answer:
x-rays
Explanation:
because x-rays have the highest nd it can penetrate through human body and much other things
Given:
Diprotic weak acid H2A:
Ka1 = 3.2 x 10^-6
Ka2 = 6.1 x 10^-9.
Concentration = 0.0650 m
Balanced chemical equation:
H2A ===> 2H+ + A2-
0.0650 0 0
-x 2x x
------------------------------
0.065 - x 2x x
ka1 = 3.2 x 10^-6 = [2x]^2 * [x] / (0.065 - x)
solve for x and determine the concentration at equilibrium.