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The hydronium ion concentration of the solution with given value of pOH is 7.94 × 10⁻⁸M.
Option D) is the correct answer.
<h3>What is pH of solution?</h3>
The pH of a solution is defined as the logarithm of the reciprocal of the hydrogen ion concentration [H+] of the given solution.
From the formular;
pH = -log[ H⁺ ]
pH + pOH = 14
Given that;
- Hydronium ion concentration OH⁻ = ?
First we find the pH
pH + pOH = 14
pH + 6.90 = 14
pH = 14 - 6.90
pH = 7.1
Now, from the above expression;
pH = -log[ H⁺ ]
Hence;
[ H⁺] = 10^(-pH)
[ H⁺] = 10^(-7.1)
[ H⁺] = 7.94 × 10⁻⁸M
Therefore, the hydronium ion concentration of the solution with given value of pOH is 7.94 × 10⁻⁸M.
Option D) is the correct answer.
Learn more about pH & pOH here: brainly.com/question/17144456
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(total mark/number of subjects)×100=63
(total mark+20+2)/(number of subjects)×100=65
(total mark+22)/number of subjects=0.65
let n be the total number of subjects
((0.63 of 100n)+22)÷(100n)=0.65
because he obtained only 63 percent from sum of all marks.(marks counted from 100)
(0.63×100n+22)÷(100n)=0.65
0.63+(22÷100n)=0.65
0.22÷n=0.65-0.63
0.22÷n=0.02
n=0.22/0.02
n=11
there were 11 subjects