FriesAintHere1392
25.01.2021 •
Chemistry
Use the following chemical equation to answer the question.
4K(s) + O2(g) → 2 K2O(s)
If a staff member at a laboratory has 12.0 grams of potassium metal, what mass of potassium oxide could the scientist potentially produce from the reaction with oxygen gas?
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Ответ:
C. 13.65.
Explanation:
With the given hydroxide ion concentration [OH⁻] we can calculate the pOH of the solution, using the following formula:
pOH = -log[OH⁻]pOH = 0.35Then, with the pOH we can proceed to calculate the pH of the solution, with the formula:
pH + pOH = 14pH = 14 - pOHpH = 13.65The correct answer is option C. 13.65.