Find the weight of KOH in its 50 milli equivalents:
Correct answer: C. 2.8
- A. 1.6
- B. 2.2
- C. 2.8
- D. 4.8
Explanation
To find the weight of KOH in its 50 milliequivalents, we use the formula:Weight (in grams) = Milliequivalents × Equivalent weightThe equivalent weight of KOH is equal to its molar mass divided by the number of equivalents of hydroxide ions it provides, which is 1, as KOH dissociates to produce one hydroxide ion (OH-) per molecule.The molar mass of KOH is calculated as follows:K (potassium) = 39.10 g/molO (oxygen) = 16.00 g/molH (hydrogen) = 1.01 g/molThus, the molar mass of KOH = 39.10 + 16.00 + 1.01 = 56.11 g/molNow, calculate the weight:Weight = 50 milliequivalents × (56.11 g/mol) / 1000Weight = 50 × 0.05611 gWeight = 2.8055 grams, which rounds to 2.8 grams.Therefore, the correct answer is 2.8 grams. Options 1.6, 2.2, and 4.8 grams are incorrect as they do not match the calculated weight using the formula.
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