Mole fraction of the potassium iodide
Exactly 56 grams of sodium sulfate, 51 grams of potassium iodide, and 48 grams of barium perchlorate were dissolved in 500 mL of water. What is the mole fraction of the potassium iodide?
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A airplane flies directly away from you. If you perceive its engine sound at 82 % of the emitted frequency, the plane's speed is:
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