The uncertainty principle is one of the most famous (and probably misunderstood) ideas in physics. It tells us that there is a fuzziness in nature, a fundamental limit to what we can know about the behaviour of quantum particles and, therefore, the smallest scales of nature. Of these scales, the most we can hope for is to calculate probabilities for where things are and how they will behave. Unlike Isaac Newton's clockwork universe, where everything follows clear-cut laws on how to move and prediction is easy if you know the starting conditions, the uncertainty principle enshrines a level of fuzziness into quantum theory.
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The answer is b because the autor in the passage said .
The water on differ metals in a lab
Answer:
The actual yield is 2.675 grams and the theoretical yield is 4.0543 grams.
Explanation:
Based on the given question the reaction will be,
SiO₂ (s) + 4HF ⇒ SiF₄ + 2H₂O (l)
Let w be the concentration of silicon tetrafluoride generated by reacting silicon dioxide with hydrogen fluoride. The mass of silicon dioxide given in the question is 2.339 grams. The molar mass of silicon dioxide is 60 grams per mole and the molar mass of silicon tetrafluoride is 104 grams per mole.
Therefore, it can be said that 60 grams of silicon dioxide is giving rise to 104 grams of silicon tetrafluoride. So, 2.339 grams of silicon dioxide will generate,
As w is the weight of silicon tetrafluoride produced, so with the help of cross-multiplication we get,
60 × w = 2.339 × 104
w = 2.339 × 104 / 60 = 4.054 grams is the theoretical yield. However, the actual yield is 2.675 grams. So, the percent yield will be,
Percent yield = actual yield / theoretical yield × 100
Percent yield = 2.675 grams / 4.054 grams × 100
Percent yield = 65.98 %
